diff --git a/W11/ArticleRepository.java b/W11/ArticleRepository.java
deleted file mode 100644
index e9a97db..0000000
--- a/W11/ArticleRepository.java
+++ /dev/null
@@ -1,67 +0,0 @@
-package com.example.datacollect.repository;
-
-import com.example.datacollect.model.Article;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
-
-public class ArticleRepository {
-    private static final Logger logger = LoggerFactory.getLogger(ArticleRepository.class);
-    private final List<Article> articles = new ArrayList<>();
-
-    public void add(Article article) {
-        if (article == null) {
-            logger.error("Attempted to add null article");
-            throw new IllegalArgumentException("Article cannot be null");
-        }
-        if (article.getTitle() == null || article.getTitle().trim().isEmpty()) {
-            logger.warn("Attempted to add article with empty title");
-            throw new IllegalArgumentException("Article title cannot be null or empty");
-        }
-        if (article.getUrl() == null || article.getUrl().trim().isEmpty()) {
-            logger.warn("Attempted to add article with empty URL");
-            throw new IllegalArgumentException("Article URL cannot be null or empty");
-        }
-        articles.add(article);
-        logger.debug("Added article: {}", article.getTitle());
-    }
-
-    public void addAll(List<Article> articlesToAdd) {
-        if (articlesToAdd == null) {
-            logger.error("Attempted to add null list of articles");
-            throw new IllegalArgumentException("Article list cannot be null");
-        }
-        for (Article article : articlesToAdd) {
-            add(article);
-        }
-        logger.info("Added {} articles to repository", articlesToAdd.size());
-    }
-
-    public List<Article> getAll() {
-        logger.debug("Retrieving all articles, count: {}", articles.size());
-        return Collections.unmodifiableList(articles);
-    }
-
-    public int size() {
-        return articles.size();
-    }
-
-    public void clear() {
-        logger.info("Clearing repository, removed {} articles", articles.size());
-        articles.clear();
-    }
-
-    public boolean isEmpty() {
-        return articles.isEmpty();
-    }
-
-    public Article get(int index) {
-        if (index < 0 || index >= articles.size()) {
-            logger.error("Attempted to access article at invalid index: {}", index);
-            throw new IndexOutOfBoundsException("Index: " + index + ", Size: " + articles.size());
-        }
-        return articles.get(index);
-    }
-}