diff --git a/wallamanta/worker.py b/wallamanta/worker.py
index 0c89ffa..00798ea 100644
--- a/wallamanta/worker.py
+++ b/wallamanta/worker.py
@@ -61,24 +61,24 @@ class Worker:
         logging.info(f"First run for {product['product_name']} for {walladb.get_user(product['telegram_user_id'])} ({walladb.get_user(product['telegram_user_id'])})")
         for i in range(5):
             helpers.random_wait()
-        list = []
+        list = {}
         if not helpers.is_valid_request(product):
             return list
         if product['category'] == '':
             articles = self.request(product['product_name'], 0, product['latitude'], product['longitude'], product['distance'], product['condition'], product['min_price'], product['max_price'], product['category'])
             for article in articles: 
-                list.insert(0, article['id'])
+                list[article['id']] = 1
         else:
             if '0' in product['category'].split(','):
                 articles = self.request(product['product_name'], 0, product['latitude'], product['longitude'], product['distance'], product['condition'], product['min_price'], product['max_price'])
                 for article in articles: 
-                    list.insert(0, article['id'])
+                    list[article['id']] = 1
             else:
                 for category in product['category'].split(','):
                     if product['subcategory'] == '' or not helpers.has_subcategory(category):
                         articles = self.request(product['product_name'], 0, product['latitude'], product['longitude'], product['distance'], product['condition'], product['min_price'], product['max_price'], category)
                         for article in articles: 
-                            list.insert(0, article['id'])
+                            list[article['id']] = 1
                     else:
                         subcategories = []
                         for subcategory in product['subcategory'].split(','):
@@ -86,7 +86,7 @@ class Worker:
                                 subcategories.append(subcategory)
                         articles = self.request(product['product_name'], 0, product['latitude'], product['longitude'], product['distance'], product['condition'], product['min_price'], product['max_price'], category, subcategories)
                         for article in articles: 
-                            list.insert(0, article['id'])
+                            list[article['id']] = 1
         return list
 
     async def work(self, product, list):
@@ -104,7 +104,7 @@ class Worker:
                 if '0' in product['category'].split(','):
                     articles = self.request(product['product_name'], 0, product['latitude'], product['longitude'], product['distance'], product['condition'], product['min_price'], product['max_price'])
                     for article in articles: 
-                        list.insert(0, article['id'])
+                        list[article['id']] = 1
                 else:
                     for category in product['category'].split(','):
                         if product['subcategory'] == '' or not helpers.has_subcategory(category):
@@ -127,7 +127,7 @@ class Worker:
                                     await helpers.send_article(article, product)
                                 await asyncio.sleep(1)
                                 #time.sleep(1) # Avoid Telegram flood restriction
-                            list.insert(0, article['id'])   
+                            list[article['id']] = 1
                         except Exception as e:
                             logging.info("---------- EXCEPTION -----------")
                             logging.info(f"{product['product_name']} worker crashed. {e}")