#185 a typo is fixed

Author: Hamid Gasmi

09-problems/graph-algorithms-in-genome-sequencing/kmer_overlap_graph.py

@@ -40,7 +40,7 @@ def _build_adjacency_list(self, patterns):
     def get_node_id(self, pattern):
 
         is_new_node = False
-        if pattern in self.nodes:
+        if pattern in self.nodes_ids:
             node_id = self.nodes_ids[pattern]
             is_new_node = False
         else: