Article(id=1279511640907428492, tenantId=1146029695717560320, journalId=1278651732997652489, issueId=1279511628118986881, articleNumber=null, orderNo=null, doi=10.12086/oee.2026.250284, pmid=null, cstr=32245.14.oee.2026.250284, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1758470400000, receivedDateStr=2025-09-22, revisedDate=1767888000000, revisedDateStr=2026-01-09, acceptedDate=1768492800000, acceptedDateStr=2026-01-16, onlineDate=1782988947368, onlineDateStr=2026-07-02, pubDate=1776960000000, pubDateStr=2026-04-24, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1782988947368, onlineIssueDateStr=2026-07-02, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1782988947368, creator=13701087609, updateTime=1782988947368, updator=13701087609, issue=Issue{id=1279511628118986881, tenantId=1146029695717560320, journalId=1278651732997652489, year='2026', volume='53', issue='4', pageStart='250244', pageEnd='250340', issueExtLink='null', onlineDate='null', pubDate='1776960000000', pubDateStr='2026-04-24', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1782988944320, creator='13701087609', updateTime=1782988944320, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext=null, issueFiles=null, downloadFileDto=null}, startPage=250284, endPage=, ext={EN=ArticleExt(id=1279511648448787085, articleId=1279511640907428492, tenantId=1146029695717560320, journalId=1278651732997652489, language=EN, title=Incremental learning-driven method for identification of unknown new pollutants based on three-dimensional fluorescence spectroscopy, columnId=1279511634116841602, journalTitle=Opto-Electronic Engineering, columnName=Article, runingTitle=null, highlight=null, articleAbstract=
Objective As various emerging new pollutants continue to emerge and multiply in the environment, their potential ecological toxicity, bioaccumulation, and environmental persistence have become increasingly prominent, posing severe, multidimensional, and complex threats to natural ecosystems and human health. Notably, emerging new pollutants typically lack historical reference data, making it difficult to generate the labels required for supervised learning. Given that conventional detection approaches rely heavily on large-scale labeled datasets for model training, such a dearth of prior data severely constrains their applicability. Consequently, traditional methods often exhibit unsatisfactory performance in the identification of unknown new pollutants.
Methods In response, an innovative method for constructing a dynamic feature code library by coupling three-dimensional fluorescence spectroscopy with long short-term memory (LSTM) networks and incremental learning was proposed, with the specific purpose of enabling accurate identification of uncharacterized new pollutants. This method first reconstructs three-dimensional fluorescence spectroscopy data into quasi-time series ordered by excitation wavelengths, thereby obtaining a dynamic sequence with intrinsic order and contextual correlations. A wealth of chemical information, including the species and concentration of target analytes, is concealed within this sequence. It then leverages LSTM networks to sequentially read the emission spectra corresponding to each excitation wavelength, enabling the capture of dependencies between different wavelengths. Finally, after iterating through all emission spectra, the final output of the last time step is taken as the feature representation. This output serves as the feature code for the fluorescence spectrum of the pollutant sample and can be used for identification. Through this process, discriminative feature codes that can highly represent the overall spectral information are extracted; these codes encapsulate the core characteristics of the spectra, laying a solid foundation for subsequent pollutant identification. Furthermore, an incremental learning mechanism is introduced. This mechanism constructs a dynamically expandable feature code library based on the previously derived feature codes, achieves automatic identification of unknown pollutants by leveraging the calculated similarity threshold, and further integrates the feature codes of these newly identified pollutants into the library to support subsequent detection tasks. This design ensures that while the model continuously learns the features of new pollutants, it still maintains robust recognition performance for existing contaminants, resolving the issue that traditional recognition methods are unable to identify pollutants not included in their training data.
Results and Discussions To verify whether this method possesses the capability of continuously learning knowledge from untrained pollutant samples, three rounds of tests were designed. To simulate the variability present in real-world environments, test samples under different pH conditions were incorporated. The test results demonstrated that this method achieved an identification accuracy of 93.3% for known pollutant categories and 91.7% for unknown new pollutant categories. These results indicate that the method exhibits excellent performance in both mitigating catastrophic forgetting and adapting to knowledge pertaining to new categories, fully validating its capacity for continuous learning and incremental identification. Furthermore, to evaluate the effectiveness of the proposed method, simulated pollution experiments were conducted by adding five typical contaminants to river water samples. The results demonstrate the proposed method achieved an identification accuracy of 93.3% for single pollutants, outperforming principal component analysis, parallel factor analysis, residual neural networks, and the incremental learning benchmark iCaRL. This is attributed to the fact that the proposed method can effectively capture the complex dependencies inherent in pollutant sample data along the excitation wavelength dimension, thereby extracting feature representations with stronger discriminative power and significantly enhancing the robustness against background fluorescence interference in river water matrices. In addition, the proposed method achieves an accuracy of 70.8% in the complete identification of all components in mixed pollutants. Although this performance is slightly lower than that in single-pollutant identification tasks, it still surpasses other comparative methods. The slight performance limitation stems from the fact that the fluorescence peaks of two specific pollutants are relatively close in position. When mixed, these two components tend to cause feature-level confusion, leading the model to occasionally misclassify them as a single substance, which somewhat constrains the overall identification performance for mixed samples. Despite such challenges, the relative superiority of the proposed method across key metrics demonstrates its strong potential and promising application prospects in the field of mixed pollutant identification.
Conclusions In summary, by capturing the dependencies across different wavelengths of three-dimensional fluorescence spectroscopy data to extract feature codes and integrating an incremental learning mechanism, the proposed method provides a robust solution for the identification of unknown new pollutants. Not only can this method effectively identify known pollutants, but it also possesses the capability to learn from unknown new pollutants and transfer the acquired feature information to subsequent detection tasks, thus demonstrating favorable knowledge transfer and continuous learning characteristics. This demonstrates its excellent scalability and adaptive capability. With the continuous incorporation of additional contaminant feature codes, the method can gradually expand its recognition scope, thereby offering a reliable technical solution for the long-term monitoring and identification of emerging contaminants.
, authors=Yingtian Hu
1, *, Lianjie Fang
1, Mai Hao
1, Xiaowen Dong
1, Dongdong Zhao
2, authorsList=Yingtian Hu, Lianjie Fang, Mai Hao, Xiaowen Dong, Dongdong Zhao, authorCompany=null, correspAuthors=Yingtian Hu, authorNote=null, correspAuthorsNote=
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针对未知新污染物监测挑战,提出了一种基于三维荧光光谱的增量学习驱动的动态特征码库构建及未知新污染物识别方法。该方法将光谱数据按激发波长的顺序重构为时序信号,利用长短期记忆网络提取具有鉴别性的特征表示,并引入增量学习机制构建动态特征码库,实现未知新污染物的自动识别与特征码入库。在河水污染模拟实验中,本方法对单一污染物的识别准确率达到93.3%,对混合污染物中所有组分均正确识别的比例达70.8%,性能优于主成分分析、平行因子分析、残差神经网络及增量学习基准方法iCaRL,表现出良好的扩展性与适应能力。
, authors=胡映天
1, *, 方连杰
1, 郝麦
1, 董晓文
1, 赵冬冬
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Self-built three-dimensional fluorescence spectroscopy acquisition equipment. (a) Optical schematic diagram;(b) Physical image, figureFileSmall=fo2L2AkXY9hPXqAB+aHfVA==, figureFileBig=Ij41dX5Vrx/lGd6Bh4IagQ==, tableContent=null), ArticleFig(id=1280951055454278491, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1279511640907428492, language=CN, label=图1, caption=
自建三维荧光光谱采集设备。(a)光学原理图;(b)实物图, figureFileSmall=fo2L2AkXY9hPXqAB+aHfVA==, figureFileBig=Ij41dX5Vrx/lGd6Bh4IagQ==, tableContent=null), ArticleFig(id=1280951055575913308, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1279511640907428492, language=EN, label=Fig.2, caption=
Core unit of LSTM, figureFileSmall=UmkG+lLY/i526w71A0y+cg==, figureFileBig=BpBs+dJffEGo0EQzLD344w==, tableContent=null), ArticleFig(id=1280951055655605085, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1279511640907428492, language=CN, label=图2, caption=
长短期记忆网络核心单元, figureFileSmall=UmkG+lLY/i526w71A0y+cg==, figureFileBig=BpBs+dJffEGo0EQzLD344w==, tableContent=null), ArticleFig(id=1280951055785628510, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1279511640907428492, language=EN, label=Fig.3, caption=
Pollutants identification based on incremental learning, figureFileSmall=gpyYEJz81Bd55gWAu21rDQ==, figureFileBig=bereUNDBso6DAuCbr96YCw==, tableContent=null), ArticleFig(id=1280951055852737375, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1279511640907428492, language=CN, label=图3, caption=
基于增量学习的污染物识别, figureFileSmall=gpyYEJz81Bd55gWAu21rDQ==, figureFileBig=bereUNDBso6DAuCbr96YCw==, tableContent=null), ArticleFig(id=1280951055940817760, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1279511640907428492, language=EN, label=Fig.4, caption=
Three-dimensional fluorescence spectra of five pollutants. (a) Salicylic acid; (b) Aniline; (c) Ciprofloxacin; (d) Fluorescein; (e) Norfloxacin, figureFileSmall=sVXNhkBmbVTSFQ9/4Osfeg==, figureFileBig=g4tEwuehX2h6dZGC7R1IrA==, tableContent=null), ArticleFig(id=1280951056024703841, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1279511640907428492, language=CN, label=图4, caption=
五种污染物的三维荧光光谱图。(a)水杨酸;(b)苯胺;(c)环丙沙星;(d)荧光素;(e)诺氟沙星, figureFileSmall=sVXNhkBmbVTSFQ9/4Osfeg==, figureFileBig=g4tEwuehX2h6dZGC7R1IrA==, tableContent=null), ArticleFig(id=1280951056100201314, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1279511640907428492, language=EN, label=Fig.5, caption=
Visualization of input gate weights, figureFileSmall=mWuhy6aIOSO7nrZtIPuPqw==, figureFileBig=pqOif630dWBIGJL+oGosxw==, tableContent=null), ArticleFig(id=1280951056167310179, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1279511640907428492, language=CN, label=图5, caption=
输入门权重可视化, figureFileSmall=mWuhy6aIOSO7nrZtIPuPqw==, figureFileBig=pqOif630dWBIGJL+oGosxw==, tableContent=null), ArticleFig(id=1280951056288944996, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1279511640907428492, language=EN, label=Fig.6, caption=
Feature visualization based on t-SNE, figureFileSmall=UFF89nbZQEuLYFcyI4Mgzw==, figureFileBig=uVRXeqQ5BYSBujUWLSUlGQ==, tableContent=null), ArticleFig(id=1280951056377025381, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1279511640907428492, language=CN, label=图6, caption=
基于t-SNE的特征可视化, figureFileSmall=UFF89nbZQEuLYFcyI4Mgzw==, figureFileBig=uVRXeqQ5BYSBujUWLSUlGQ==, tableContent=null), ArticleFig(id=1280951056486077286, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1279511640907428492, language=EN, label=Fig.7, caption=
The results of three rounds of tests. (a) Old-class pollutants; (b) New-class pollutants; (c) All-class pollutants, figureFileSmall=gyqh39L/F2BsytCwWzuGJQ==, figureFileBig=4J+47gvykQ9R4an9oI/F4g==, tableContent=null), ArticleFig(id=1280951056565769063, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1279511640907428492, language=CN, label=图7, caption=
三轮测试结果。(a)旧类污染物;(b)新类污染物;(c)全部污染物, figureFileSmall=gyqh39L/F2BsytCwWzuGJQ==, figureFileBig=4J+47gvykQ9R4an9oI/F4g==, tableContent=null), ArticleFig(id=1280951056720958312, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1279511640907428492, language=EN, label=Tab.1, caption=
The concentration ranges and sample sizes of the four pollutants
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| Pollutants | Concentration range/(mg/L) | Sample size |
| Salicylic acid | 0.1-10 | 18 |
| Aniline | 0.1-10 | 18 |
| Ciprofloxacin | 0.1-10 | 18 |
| Fluorescein | 0.1-10 | 12 |
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四种污染物的浓度范围和样本数量
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| Pollutants | Concentration range/(mg/L) | Sample size |
| Salicylic acid | 0.1-10 | 18 |
| Aniline | 0.1-10 | 18 |
| Ciprofloxacin | 0.1-10 | 18 |
| Fluorescein | 0.1-10 | 12 |
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The pH ranges and sample sizes of the three pollutants
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| Pollutants and concentration | pH ranges | pH intervals | Sample size |
| 1 mg/L salicylic acid | 2.4-4.4 | 0.5 | 5 |
| 5 mg/L aniline | 4.8-6.8 | 0.5 | 5 |
| 0.3 mg/L ciprofloxacin | 7.1-10.3 | 0.8 | 5 |
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三种污染物的pH范围和样本数量
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| Pollutants and concentration | pH ranges | pH intervals | Sample size |
| 1 mg/L salicylic acid | 2.4-4.4 | 0.5 | 5 |
| 5 mg/L aniline | 4.8-6.8 | 0.5 | 5 |
| 0.3 mg/L ciprofloxacin | 7.1-10.3 | 0.8 | 5 |
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Results of three-fold cross-validation
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| Score for each fold | Mean ± standard deviation |
| 1.000 | 1.000 | 0.944 | 0.981±0.026 |
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三折交叉验证结果
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| Score for each fold | Mean ± standard deviation |
| 1.000 | 1.000 | 0.944 | 0.981±0.026 |
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Three-round testing procedure
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| Procedure | Training dataset | First-round test | Second-round test | Third-round test |
Pollutant species | Salicylic acid, aniline, ciprofloxacin | Salicylic acid, aniline, ciprofloxacin, fluorescein (newly added) | Salicylic acid, aniline, ciprofloxacin, fluorescein (newly added) | Salicylic acid, ciprofloxacin, and aniline at different pH levels, fluorescein (newly added) |
| Purpose | Training on old classes | New class learning | Performance testing on new classes | Robustness verification |
), ArticleFig(id=1280951057295577967, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1279511640907428492, language=CN, label=表4, caption=
三轮测试流程
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| Procedure | Training dataset | First-round test | Second-round test | Third-round test |
Pollutant species | Salicylic acid, aniline, ciprofloxacin | Salicylic acid, aniline, ciprofloxacin, fluorescein (newly added) | Salicylic acid, aniline, ciprofloxacin, fluorescein (newly added) | Salicylic acid, ciprofloxacin, and aniline at different pH levels, fluorescein (newly added) |
| Purpose | Training on old classes | New class learning | Performance testing on new classes | Robustness verification |
), ArticleFig(id=1280951057387852656, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1279511640907428492, language=EN, label=Tab.5, caption=
The concentration ranges and sample sizes of the five pollutants
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| Pollutants | Concentrations/(mg/L) |
| Sample 1 | Sample 2 | Sample 3 | Sample 4 | Sample 5 | Sample 6 |
| Salicylic acid | 1.4 | 1.8 | 2.4 | 2.8 | 3.4 | 3.8 |
| Aniline | 0.5 | 1 | 1.2 | 1.5 | 1.6 | 2 |
| Ciprofloxacin | 0.01 | 0.02 | 0.03 | 0.04 | 0.05 | 0.06 |
| Fluorescein | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 | 0.6 |
| Norfloxacin | 0.1 | 1 | 2 | 3 | 4 | 5 |
), ArticleFig(id=1280951057454961521, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1279511640907428492, language=CN, label=表5, caption=
五种污染物的浓度范围和样本数量
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| Pollutants | Concentrations/(mg/L) |
| Sample 1 | Sample 2 | Sample 3 | Sample 4 | Sample 5 | Sample 6 |
| Salicylic acid | 1.4 | 1.8 | 2.4 | 2.8 | 3.4 | 3.8 |
| Aniline | 0.5 | 1 | 1.2 | 1.5 | 1.6 | 2 |
| Ciprofloxacin | 0.01 | 0.02 | 0.03 | 0.04 | 0.05 | 0.06 |
| Fluorescein | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 | 0.6 |
| Norfloxacin | 0.1 | 1 | 2 | 3 | 4 | 5 |
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Concentrations of mixed pollutant samples
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| Pollutants | Concentrations/(mg/L) |
| Sample 1 | Sample 2 | Sample 3 | Sample 4 | Sample 5 | Sample 6 | Sample 7 | Sample 8 |
| Salicylic acid/ciprofloxacin | 1/2 | 1/3 | 1/4 | 1/5 | 3/1 | 3/2 | 3/3 | 3/4 |
| Salicylic acid/norfloxacin | 1/5 | 2/1.5 | 3/1.5 | 4/1.5 | 4/2.5 | 4/3.5 | 4/4.5 | 5/1 |
| Ciprofloxacin/norfloxacin | 1/2 | 1/3 | 1/4 | 1/5 | 2/2 | 3/2 | 4/2 | 5/2 |
), ArticleFig(id=1280951057610150771, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1279511640907428492, language=CN, label=表6, caption=
混合污染物样本浓度
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| Pollutants | Concentrations/(mg/L) |
| Sample 1 | Sample 2 | Sample 3 | Sample 4 | Sample 5 | Sample 6 | Sample 7 | Sample 8 |
| Salicylic acid/ciprofloxacin | 1/2 | 1/3 | 1/4 | 1/5 | 3/1 | 3/2 | 3/3 | 3/4 |
| Salicylic acid/norfloxacin | 1/5 | 2/1.5 | 3/1.5 | 4/1.5 | 4/2.5 | 4/3.5 | 4/4.5 | 5/1 |
| Ciprofloxacin/norfloxacin | 1/2 | 1/3 | 1/4 | 1/5 | 2/2 | 3/2 | 4/2 | 5/2 |
), ArticleFig(id=1280951057702425460, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1279511640907428492, language=EN, label=Tab.7, caption=
Three-round simulated pollution testing schedule
, figureFileSmall=null, figureFileBig=null, tableContent=
| Procedure | Training dataset | First test | Second test | Third test |
| Pollutant species | Salicylic acid, aniline, ciprofloxacin | Salicylic acid, aniline, ciprofloxacin, fluorescein (newly added), norfloxacin (newly added) | Salicylic acid, aniline, ciprofloxacin, fluorescein (newly added), norfloxacin (newly added) | Pairwise mixtures of Salicylic acid, ciprofloxacin and norfloxacin |
| Purpose | Training on old classes | New class learning | Performance testing on new classes | Complex environment adaptability test |
), ArticleFig(id=1280951057777922933, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1279511640907428492, language=CN, label=表7, caption=
模拟污染三轮测试安排
, figureFileSmall=null, figureFileBig=null, tableContent=
| Procedure | Training dataset | First test | Second test | Third test |
| Pollutant species | Salicylic acid, aniline, ciprofloxacin | Salicylic acid, aniline, ciprofloxacin, fluorescein (newly added), norfloxacin (newly added) | Salicylic acid, aniline, ciprofloxacin, fluorescein (newly added), norfloxacin (newly added) | Pairwise mixtures of Salicylic acid, ciprofloxacin and norfloxacin |
| Purpose | Training on old classes | New class learning | Performance testing on new classes | Complex environment adaptability test |
), ArticleFig(id=1280951057878586230, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1279511640907428492, language=EN, label=Tab.8, caption=
Comparison of the results of the simulation river pollution experiment
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| Method | Accuracy rates per round/% |
| First round | Second round | Third round |
| All correct | Partially correct | All wrong |
| PCA | 50.0 | 66.7 | 16.7 | 62.5 | 20.8 |
| PARAFAC | 50.0 | 60.0 | 16.7 | 66.6 | 16.7 |
| ResNet | 53.3 | 76.7 | 41.7 | 50.0 | 8.3 |
| iCaRL | 53.3 | 83.3 | 54.2 | 45.8 | 0 |
| Proposed | 56.7 | 93.3 | 70.8 | 29.2 | 0 |
), ArticleFig(id=1280951057962472311, tenantId=1146029695717560320, journalId=1278651732997652489, articleId=1279511640907428492, language=CN, label=表8, caption=
河流污染模拟实验的结果比较
, figureFileSmall=null, figureFileBig=null, tableContent=
| Method | Accuracy rates per round/% |
| First round | Second round | Third round |
| All correct | Partially correct | All wrong |
| PCA | 50.0 | 66.7 | 16.7 | 62.5 | 20.8 |
| PARAFAC | 50.0 | 60.0 | 16.7 | 66.6 | 16.7 |
| ResNet | 53.3 | 76.7 | 41.7 | 50.0 | 8.3 |
| iCaRL | 53.3 | 83.3 | 54.2 | 45.8 | 0 |
| Proposed | 56.7 | 93.3 | 70.8 | 29.2 | 0 |
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