Corrected bug in lemma_lookup oracle

transition_machine/src/Oracle.cpp

@@ -321,8 +321,8 @@ void Oracle::createDatabase()
   },
   [](Config & c, Oracle * oracle)
   {
-    const std::string & form = c.getTape("FORM")[c.getHead()];
-    const std::string & pos = c.getTape("POS")[c.getHead()];
+    const std::string & form = c.getTape("FORM")[0];
+    const std::string & pos = c.getTape("POS")[0];
     std::string & lemma = oracle->data[form + "_" + pos];
 
     if(lemma.empty())