REVIEW 2 major objections 4 minor 37 references
AutoSIFT claims that a text prompt can edit individual style categories—emotion, age, gender, language—in generated speech while every unspecified category and all residual voice traits of the reference speaker are preserved.
Reviewed by Pith at T0; open to challenge. T0 means a machine referee read the full paper against a public rubric. the ladder, T0–T4 →
T0 review · deepseek-v4-flash
2026-08-02 06:20 UTC pith:3I23ZJVK
load-bearing objection AutoSIFT defines a genuinely useful task and is carefully engineered, but its core claim — overriding a text-specified style category that conflicts with the reference — is never trained or isolated; that gap is load-bearing. the 2 major comments →
AutoSIFT: Automatic Style Sifting for Controllable Speech Generation with Arbitrary Style Infilling
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
AutoSIFT claims that speaking style can be decomposed into known text-describable categories plus a residual, and that a gated infiller can replace only the categories a text prompt names while borrowing all other categories and the residual from reference speech. The infiller's rule is Eq. (9): use the text embedding where the prompt is explicit, use the speech prototype otherwise, and always keep the speech residual. The fuser is trained with Eq. (10), reconstructing the reference style embedding, with 25% of labels randomly dropped so the model learns to fall back on speech. The reported outcome: single-category edits honor the prompt while preserving speaker identity and prosody, and con
What carries the argument
The load-bearing mechanism is the gated sifting rule of Eq. (9) with asymmetric residual inheritance: for each category c_i, the fused embedding f_ci is the text embedding t_ci when the prompt specifies that category, and the stop-gradient speech prototype sg(s_hat_ci) otherwise; the residual s_hat_r is always taken from the reference speech. The gate is trained by the style reconstruction loss of Eq. (10), L_asi = ||S_hat_f - sg(S)||^2, where S is the reference style embedding. A censored-learning trick randomly drops 25% of category labels during training, so the fuser learns to pivot to the speech branch whenever a textual anchor is absent. This makes the module an infiller rather than a
Load-bearing premise
The training objective only ever shows the infiller text labels that match the reference utterance's own style categories—the censored-learning trick merely drops labels, never supplies a conflicting one—so the claim that a prompt like 'angry' can override a non-angry reference rests on the unproven assumption that the gate replaces rather than blends or ignores the reference category.
What would settle it
Run AutoSIFT on a reference clip labeled 'happy' with a text prompt 'angry', then classify the output with an independent emotion classifier and measure style similarity to the reference. If the output is not confidently 'angry' or the speaker's timbre and rhythm drift beyond what a same-speaker angry recording would show, the arbitrary-infilling claim fails; a pass requires both the requested category to land and all unrequested categories plus residual similarity to survive.
If this is right
- A neutral reference clip plus an 'angry' text prompt should produce angry speech that keeps the speaker's timbre, breathiness, and rhythm intact.
- Single-category edits are the strongest regime; as more categories are specified in text, the paper reports control accuracy declines from inter-category interference.
- Text-only prompts, speech-only prompts, and mixed prompts all drive the same frozen TTS backbone, with the infiller interpolating between the two sources.
- Language and gender control approach 100% accuracy, while emotion and age sit near 90%, reflecting how acoustically separable each category is.
- Speech-prompted generation retains high style similarity to the reference speaker, and even text-only prompts keep more than half of the reference style similarity.
Where Pith is reading between the lines
- The decisive untested case is a text prompt that directly contradicts the reference's own category label; the training procedure never presents one, so the gate's override behavior is extrapolation, and a conflicting-prompt experiment would settle it.
- Residual preservation is likely bounded by the residual codebook's capacity; ablating codebook size would reveal whether the reported style-similarity gains are true disentanglement or simply copying bandwidth.
- Because the infiller only swaps prototypes in a shared style space, the same sift-and-fill rule could extend to other discrete attributes such as accent, speaking rate, or register if prototype sets were added.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. AutoSIFT proposes Arbitrary Style Infilling (ASI): given a text prompt specifying an arbitrary subset of style categories (gender, age, emotion, language) and a reference speech utterance, the system should replace only the text-specified categories while preserving the unspecified categories and the residual, non-categorical style from the reference. The method consists of a style extractor that produces a holistic style embedding, a disentangler that decomposes it into category prototypes and a quantized residual subspace (Sec. 4.2), and an infiller that fuses text-derived category embeddings with speech-derived unspecified/residual embeddings through a hard gate (Eq. 9), trained by reconstructing the reference style embedding (Eq. 10). Experiments report disentanglement accuracy, intelligibility, naturalness, style similarity, and the proposed DSA/RSA metrics on a bilingual multi-style dataset.
Significance. If the central ASI claim holds, the paper would make a useful contribution: it formalizes a fine-grained editing task that goes both text-prompted TTS and speech-reference style transfer, and it provides a modular, reproducible pipeline with a three-stage training scheme. The evaluation is comparatively extensive: DSA/RSA use separately trained frozen evaluators on held-out real speech, the ablations (e.g., the PAL-collapse result in Table 1) are informative, and the proposed metrics directly target the stated task. These are concrete strengths. However, the current evidence does not yet establish the central claim of replacing text-specified categories when those categories conflict with the reference speech, because the training and evaluation protocols do not appear to include such conflicts.
major comments (2)
- [§4.3, Eqs. (9)–(10); §5.4, Fig. 2] The central ASI operation — replacing a reference category with a different text-specified category — is never trained or evaluated. In Eq. (9), when category c_i is specified, f_ci = t_ci, but during training the text labels are the reference utterance's own labels: the Censored Learning strategy (Sec. 4.3) randomly drops categorical labels at 25% but never substitutes a conflicting label. Therefore the fuser in Eq. (10) only ever sees text embeddings t_ci that agree with the reference category; at test time, the input combination (t_ci='angry', reference neutral) is out-of-distribution. The hard gate only selects the branch; it does not guarantee that the fuser discards category information carried by the residual, nor that it trusts the text embedding. No experiment in Sec. 5 isolates conflicting prompt/reference combinations; DSA (Eq. 20) and RSA (Eq. 21) aggregate over categories wi
- [§4.2, Eqs. (6)–(8)] The disentangler does not enforce orthogonality between the residual subspace s_r and the named category subspaces. PAL pulls each s_ci toward its prototype, and L_recon reconstructs S from prototypes plus the quantized residual, but this does not prevent the residual from encoding category-identifying cues. If s_r contains such cues, Eq. (10) can reintroduce the reference category into the fused embedding even when the text asks for a different category, because the residual is always inherited from speech. The paper should provide a direct test — e.g., probe the residual embedding with a category classifier, or report DSA specifically for conflicting prompt/reference pairs — to show the residual is category-neutral in the relevant sense.
minor comments (4)
- [§3.2, Eq. (2)] The notation \hS_{c_i} and \hS_{c_r} in Eq. (2) is not clearly connected to the later notation \hS_f in Eq. (10) and the fused latents f_ci in Eq. (9). Please align notation and state explicitly that Eq. (2) is the target behavior, not a learned module.
- [§5.1; Appendix B] DSA and RSA are central to the paper, but the appendix does not specify the architecture, training data, or label set of the frozen evaluators h_c, nor whether the evaluation prompts ever assign a text label different from the reference label. This information is needed to interpret the reported numbers.
- [Fig. 2(b)] The x-axis label 'text-descriptive style rate' is undefined. Clarify whether it is the fraction of test categories specified by text, and how the remaining categories are chosen.
- [Appendix A] The limitations section lists missing style dimensions and annotation coverage but does not mention the main limitation identified above: the model is only trained with text labels that agree with the reference, and conflicting-prompt behavior is untested. Adding this limitation, or better, fixing it, would considerably strengthen the paper.
Circularity Check
No central circularity; the main ASI claim is not reduced to a fitted value, but S-SIM uses AutoSIFT's own style extractor and the infiller training never presents conflicting text/reference labels, leaving an extrapolation gap rather than an equation-level circular reduction.
full rationale
The paper's central ASI claim is not reduced to its inputs by construction. DSA (Eq. 20) and RSA (Eq. 21) use category-specific evaluators trained independently on held-out real speech (Appendix F), so the headline control and preservation numbers are external to AutoSIFT's fitted parameters. The Style Disentangler and Infiller are trained with reconstruction losses (Eqs. 8, 10) and PAL (Eq. 6), which learn to decompose and recompose the reference style embedding; the text-specified branch in Eq. 9 is a hard gate, not a parameter fitted to the evaluated outcome. The main caveat is not circularity but an extrapolation gap: Censored Learning (Sec. 4.3) drops 25% of labels but never substitutes a conflicting text label, so during training a specified text category always agrees with the reference; the mismatched-label case central to 'arbitrary' infilling is out-of-distribution and is not explicitly isolated in Sec. 5. This is a generalization/validity concern, not an equation-level self-reference. S-SIM (Eq. 18) uses AutoSIFT's own style extractor Esty, a self-referential component for the preservation metric, but the ASI claims also rely on RSA and independent evaluators. Self-citations to ParaMETA [10] and ParaStyleTTS [2] supply the PAL loss and frozen text encoder respectively; they are component choices, not an imported uniqueness theorem, and the paper outperforms both baselines under the same protocol. Overall no prediction reduces to a fitted value or to a self-citation chain.
Axiom & Free-Parameter Ledger
free parameters (5)
- category subspace dimension d=48 =
48
- VQ codebook size K =
not reported
- VQ commitment beta =
not reported
- censored label drop rate =
25%
- loss weights for L_recon, L_PAL, L_VQ =
implicitly 1.0
axioms (4)
- domain assumption The global style embedding S is a sufficient statistic for all speaking-style information needed for reconstruction and control.
- ad hoc to paper Linear projectors from the global style embedding S yield independent, semantically meaningful category subspaces.
- ad hoc to paper A text-specified category can be swapped into the fused embedding while the reconstruction target remains the reference style embedding S.
- ad hoc to paper The residual style c_r is fully captured by the VQ codebook and is orthogonal to the named categories.
invented entities (2)
-
Residual Style Category c_r
no independent evidence
-
Style Prototypes P_ci
no independent evidence
Cite this review
Pith. "Pith review of AutoSIFT: Automatic Style Sifting for Controllable Speech Generation with Arbitrary Style Infilling." pith.science (2026). https://pith.science/paper/3I23ZJVK
@misc{pith2026260712706,
author = {Pith},
title = {Pith review of: AutoSIFT: Automatic Style Sifting for Controllable Speech Generation with Arbitrary Style Infilling},
year = {2026},
howpublished = {\url{https://pith.science/paper/3I23ZJVK}},
note = {Machine review of arXiv:2607.12706}
}
read the original abstract
State-of-the-art text-to-speech (TTS) models achieve impressive naturalness and expressiveness, yet fine-grained, disentangled control over speaking styles remains challenging. In professional scenarios such as film dubbing, game voice acting, and video content generation, users often need to modify a specific style category, such as emotion, age, or gender, while preserving all others. Existing style-controllable TTS methods typically rely on either text-described styles or speech-reference style transfer, making it difficult to jointly control explicit semantic attributes and preserve subtle, text-undescribed prosodic details. We propose AutoSIFT, a controllable speech generation framework for category-level style editing. AutoSIFT decomposes speaking style into known text-describable categories and unknown residual styles that capture non-verbal prosody and speaker-specific nuances. It consists of a generalized Style Disentangler, which extracts category-aware style prototypes from reference speech, and an Arbitrary Style Infiller, which selectively infills unspecified style categories from the reference. By replacing only text-specified style categories while preserving residual speech-derived styles, AutoSIFT enables natural, expressive, and highly customizable speech generation.
Figures
Reference graph
Works this paper leans on
-
[1]
Prompttts 2: Describing and generating voices with text prompt.arXiv preprint arXiv:2309.02285, 2023
Yichong Leng, Zhifang Guo, Kai Shen, Xu Tan, Zeqian Ju, Yanqing Liu, Yufei Liu, Dongchao Yang, Leying Zhang, Kaitao Song, et al. Prompttts 2: Describing and generating voices with text prompt.arXiv preprint arXiv:2309.02285, 2023
Pith/arXiv arXiv 2023
-
[2]
Parastyletts: Toward efficient and robust paralinguistic style control for expressive text-to-speech generation
Haowei Lou, Hye-Young Paik, Wen Hu, and Lina Yao. Parastyletts: Toward efficient and robust paralinguistic style control for expressive text-to-speech generation. InProceedings of the 34th ACM International Conference on Information and Knowledge Management, pages 1979–1988, 2025
1979
-
[3]
Yourtts: Towards zero-shot multi-speaker tts and zero-shot voice conversion for everyone
Edresson Casanova, Julian Weber, Christopher D Shulby, Arnaldo Candido Junior, Eren Gölge, and Moacir A Ponti. Yourtts: Towards zero-shot multi-speaker tts and zero-shot voice conversion for everyone. InInternational conference on machine learning, pages 2709–2720. PMLR, 2022
2022
-
[4]
Wei Deng, Siyi Zhou, Jingchen Shu, Jinchao Wang, and Lu Wang. Indextts: An industrial-level controllable and efficient zero-shot text-to-speech system.arXiv preprint arXiv:2502.05512, 2025
Pith/arXiv arXiv 2025
-
[5]
Autovc: Zero-shot voice style transfer with only autoencoder loss
Kaizhi Qian, Yang Zhang, Shiyu Chang, Xuesong Yang, and Mark Hasegawa-Johnson. Autovc: Zero-shot voice style transfer with only autoencoder loss. InInternational Conference on Machine Learning, pages 5210–5219. PMLR, 2019
2019
-
[6]
Speechsplit2
Chak Ho Chan, Kaizhi Qian, Yang Zhang, and Mark Hasegawa-Johnson. Speechsplit2. 0: Unsupervised speech disentanglement for voice conversion without tuning autoencoder bottle- necks. InICASSP 2022-2022 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), pages 6332–6336. IEEE, 2022
2022
-
[7]
Zhihao Du, Qian Chen, Shiliang Zhang, Kai Hu, Heng Lu, Yexin Yang, Hangrui Hu, Siqi Zheng, Yue Gu, Ziyang Ma, et al. Cosyvoice: A scalable multilingual zero-shot text-to-speech synthesizer based on supervised semantic tokens.arXiv preprint arXiv:2407.05407, 2024
Pith/arXiv arXiv 2024
-
[8]
Zhihao Du, Yuxuan Wang, Qian Chen, Xian Shi, Xiang Lv, Tianyu Zhao, Zhifu Gao, Yexin Yang, Changfeng Gao, Hui Wang, et al. Cosyvoice 2: Scalable streaming speech synthesis with large language models.arXiv preprint arXiv:2412.10117, 2024
Pith/arXiv arXiv 2024
-
[9]
Zhihao Du, Changfeng Gao, Yuxuan Wang, Fan Yu, Tianyu Zhao, Hao Wang, Xiang Lv, Hui Wang, Chongjia Ni, Xian Shi, et al. Cosyvoice 3: Towards in-the-wild speech generation via scaling-up and post-training.arXiv preprint arXiv:2505.17589, 2025
Pith/arXiv arXiv 2025
-
[10]
Parameta: Towards learning disentan- gled paralinguistic speaking styles representations from speech
Haowei Lou, Hye-Young Paik, Wen Hu, and Lina Yao. Parameta: Towards learning disentan- gled paralinguistic speaking styles representations from speech. InProceedings of the AAAI Conference on Artificial Intelligence, volume 40, pages 32311–32319, 2026
2026
-
[11]
Clap learning audio concepts from natural language supervision
Benjamin Elizalde, Soham Deshmukh, Mahmoud Al Ismail, and Huaming Wang. Clap learning audio concepts from natural language supervision. InICASSP 2023-2023 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), pages 1–5. IEEE, 2023. 10
2023
-
[12]
Xin Jing, Andreas Triantafyllopoulos, and Björn Schuller. Paraclap–towards a general language- audio model for computational paralinguistic tasks.arXiv preprint arXiv:2406.07203, 2024
Pith/arXiv arXiv 2024
-
[13]
Loss-balanced task weighting to reduce negative transfer in multi-task learning
Shengchao Liu, Yingyu Liang, and Anthony Gitter. Loss-balanced task weighting to reduce negative transfer in multi-task learning. InProceedings of the AAAI conference on artificial intelligence, volume 33, pages 9977–9978, 2019
2019
-
[14]
A survey on multi-task learning.IEEE transactions on knowledge and data engineering, 34(12):5586–5609, 2021
Yu Zhang and Qiang Yang. A survey on multi-task learning.IEEE transactions on knowledge and data engineering, 34(12):5586–5609, 2021
2021
-
[15]
Prompttts++: Controlling speaker identity in prompt-based text-to-speech using natural language descriptions
Reo Shimizu, Ryuichi Yamamoto, Masaya Kawamura, Yuma Shirahata, Hironori Doi, Tatsuya Komatsu, and Kentaro Tachibana. Prompttts++: Controlling speaker identity in prompt-based text-to-speech using natural language descriptions. InICASSP 2024-2024 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), pages 12672–12676. IEEE, 2024
2024
-
[16]
F5-tts: A fairytaler that fakes fluent and faithful speech with flow matching
Yushen Chen, Zhikang Niu, Ziyang Ma, and et al. F5-tts: A fairytaler that fakes fluent and faithful speech with flow matching. InProceedings of the 63rd Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers), pages 6255–6271, 2025
2025
-
[17]
Prompttts: Controllable text-to-speech with text descriptions
Zhifang Guo, Yichong Leng, Yihan Wu, Sheng Zhao, and Xu Tan. Prompttts: Controllable text-to-speech with text descriptions. InICASSP 2023-2023 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), pages 1–5. IEEE, 2023
2023
-
[18]
Zeqian Ju, Yuancheng Wang, Kai Shen, Xu Tan, Detai Xin, Dongchao Yang, Yanqing Liu, Yichong Leng, Kaitao Song, Siliang Tang, et al. Naturalspeech 3: Zero-shot speech synthesis with factorized codec and diffusion models.arXiv preprint arXiv:2403.03100, 2024
Pith/arXiv arXiv 2024
-
[19]
Yinghao Aaron Li, Cong Han, Vinay Raghavan, Gavin Mischler, and Nima Mesgarani. Styletts 2: Towards human-level text-to-speech through style diffusion and adversarial training with large speech language models.Advances in neural information processing systems, 36:19594–19621, 2023
2023
-
[20]
Signal estimation from modified short-time fourier transform.IEEE Transactions on acoustics, speech, and signal processing, 32(2):236–243, 1984
Daniel Griffin and Jae Lim. Signal estimation from modified short-time fourier transform.IEEE Transactions on acoustics, speech, and signal processing, 32(2):236–243, 1984
1984
-
[21]
Hifi-gan: Generative adversarial networks for efficient and high fidelity speech synthesis.Advances in neural information processing systems, 33:17022–17033, 2020
Jungil Kong, Jaehyeon Kim, and Jaekyoung Bae. Hifi-gan: Generative adversarial networks for efficient and high fidelity speech synthesis.Advances in neural information processing systems, 33:17022–17033, 2020
2020
-
[22]
Flow matching for generative modeling.arXiv preprint arXiv:2210.02747, 2022
Yaron Lipman, Ricky TQ Chen, Heli Ben-Hamu, Maximilian Nickel, and Matt Le. Flow matching for generative modeling.arXiv preprint arXiv:2210.02747, 2022
Pith/arXiv arXiv 2022
-
[23]
Scalable diffusion models with transformers
William Peebles and Saining Xie. Scalable diffusion models with transformers. InProceedings of the IEEE/CVF international conference on computer vision, pages 4195–4205, 2023
2023
-
[24]
Attention is all you need.Advances in neural information processing systems, 30, 2017
Ashish Vaswani, Noam Shazeer, Niki Parmar, Jakob Uszkoreit, Llion Jones, Aidan N Gomez, Łukasz Kaiser, and Illia Polosukhin. Attention is all you need.Advances in neural information processing systems, 30, 2017
2017
-
[25]
Fastspeech 2: Fast and high-quality end-to-end text to speech.arXiv preprint arXiv:2006.04558, 2020
Yi Ren, Chenxu Hu, Xu Tan, Tao Qin, Sheng Zhao, Zhou Zhao, and Tie-Yan Liu. Fastspeech 2: Fast and high-quality end-to-end text to speech.arXiv preprint arXiv:2006.04558, 2020
Pith/arXiv arXiv 2006
-
[26]
Neural discrete representation learning.Advances in neural information processing systems, 30, 2017
Aaron Van Den Oord, Oriol Vinyals, et al. Neural discrete representation learning.Advances in neural information processing systems, 30, 2017
2017
-
[27]
Chinese mandarin female corpus
Databaker. Chinese mandarin female corpus. https://en.data-baker.com/datasets/ freeDatasets/, 2020. Accessed: 2023-04-20
2020
-
[28]
The lj speech dataset
Keith Ito and Linda Johnson. The lj speech dataset. https://keithito.com/ LJ-Speech-Dataset/, 2017
2017
-
[29]
Seen and unseen emotional style transfer for voice conversion with a new emotional speech dataset
Kun Zhou, Berrak Sisman, Rui Liu, and Haizhou Li. Seen and unseen emotional style transfer for voice conversion with a new emotional speech dataset. InICASSP 2021-2021 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), pages 920–924. IEEE, 2021. 11
2021
-
[30]
Crema-d: Crowd-sourced emotional multimodal actors dataset.IEEE transactions on affective computing, 5(4):377–390, 2014
Houwei Cao, David G Cooper, Michael K Keutmann, Ruben C Gur, Ani Nenkova, and Ragini Verma. Crema-d: Crowd-sourced emotional multimodal actors dataset.IEEE transactions on affective computing, 5(4):377–390, 2014
2014
-
[31]
Common phone: A multilingual dataset for robust acoustic modelling
Philipp Klumpp, Tomas Arias, Paula Andrea Pérez-Toro, Elmar Noeth, and Juan Orozco- Arroyave. Common phone: A multilingual dataset for robust acoustic modelling. InProceedings of the Thirteenth Language Resources and Evaluation Conference, pages 763–768, 2022
2022
-
[32]
Genshin voice: A multi-lingual voice dataset from Genshin Impact
Simon3000. Genshin voice: A multi-lingual voice dataset from Genshin Impact. https:// huggingface.co/datasets/simon3000/genshin-voice, 2025. Hugging Face Datasets
2025
-
[33]
Mpnet: Masked and permuted pre-training for language understanding.Advances in neural information processing systems, 33:16857–16867, 2020
Kaitao Song, Xu Tan, Tao Qin, Jianfeng Lu, and Tie-Yan Liu. Mpnet: Masked and permuted pre-training for language understanding.Advances in neural information processing systems, 33:16857–16867, 2020
2020
-
[34]
Learning transferable visual models from natural language supervision
Alec Radford, Jong Wook Kim, Chris Hallacy, Aditya Ramesh, Gabriel Goh, Sandhini Agarwal, Girish Sastry, Amanda Askell, Pamela Mishkin, Jack Clark, et al. Learning transferable visual models from natural language supervision. InInternational conference on machine learning, pages 8748–8763. PmLR, 2021
2021
-
[35]
Natural tts synthesis by conditioning wavenet on mel spectrogram predictions
Jonathan Shen, Ruoming Pang, Ron J Weiss, Mike Schuster, Navdeep Jaitly, Zongheng Yang, Zhifeng Chen, Yu Zhang, Yuxuan Wang, Rj Skerrv-Ryan, et al. Natural tts synthesis by conditioning wavenet on mel spectrogram predictions. In2018 IEEE international conference on acoustics, speech and signal processing (ICASSP), pages 4779–4783. IEEE, 2018
2018
-
[36]
Conditional variational autoencoder with adversar- ial learning for end-to-end text-to-speech
Jaehyeon Kim, Jungil Kong, and Juhee Son. Conditional variational autoencoder with adversar- ial learning for end-to-end text-to-speech. InInternational conference on machine learning, pages 5530–5540. PMLR, 2021
2021
-
[37]
Ilya Loshchilov and Frank Hutter. Decoupled weight decay regularization.arXiv preprint arXiv:1711.05101, 2017. 12 Supplementary Material A Limitations AutoSIFT currently focuses on a predefined set of text-describable style categories, such as gender, age, emotion, and language. While these categories cover common controllable speech generation scenarios,...
Pith/arXiv arXiv 2017
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