diff --git a/src/modules/knowledge.js b/src/modules/knowledge.js
index 7027b1f..8072414 100644
--- a/src/modules/knowledge.js
+++ b/src/modules/knowledge.js
@@ -101,7 +101,7 @@ class Knowledge {
 	static arrangement
 
 	constructor(definition) {
-		Knowledge.fullSemanticNetwork = new SemanticNetwork(definition)
+		Knowledge.semanticNetwork = new SemanticNetwork(definition)
 		Knowledge.agentSemanticNetwork = new AgentSemanticNetwork(definition)
 		Knowledge.arrangement = new Arrangement()
 	}
diff --git a/src/modules/shop.js b/src/modules/shop.js
index b7c5341..a34b787 100644
--- a/src/modules/shop.js
+++ b/src/modules/shop.js
@@ -1,5 +1,5 @@
 class Shop {
-  productsSimilarityScore(name1, name2) {
+  static productsSimilarityScore(name1, name2) {
     const [ o1, o2 ] = [name1, name2].map(name => Knowledge.semanticNetwork.findByName(name))
     if (!o1 || !o2)
       throw new Error("names should be in semantic network!")
@@ -10,7 +10,7 @@ class Shop {
 
       const set = new Set([...o1[p], ...o2[p]])
       const matching = o1[p].reduce((s, v) => s + (o2[p].indexOf(v) >= 0 ? 1 : 0), 0)
-      return matching / [...set].lengthsss
+      return matching / [...set].length
     }
 
     const [ l, c ] = [calcScore('locations'), calcScore('categories')]