diff --git a/src/automata.cpp b/src/automata.cpp
index 57a08e5..c55ee61 100644
--- a/src/automata.cpp
+++ b/src/automata.cpp
@@ -1,5 +1,6 @@
 #include "Lexesis/automata.h"
 
+#include <iostream>
 #include <cassert>
 #include <algorithm>
 #include <climits>
@@ -380,5 +381,47 @@ namespace lxs {
 
         return result;
     }
+    
+
+    ENFA merge(const std::vector<ENFA>& enfas) {
+        ENFA result;
+        unsigned int offset = 1;
+        result.starting = 0;
+        result.numStates = 1;
+        for(const auto &enfa: enfas) {
+            result.numStates += enfa.numStates;
+            for(const auto accepting: enfa.accepting) {
+                result.accepting.insert(accepting + offset);
+            }
+            for(const auto &priority: enfa.priority) {
+                result.priority[priority.first + offset] = priority.second;
+            }
+            for(const auto &acceptingToken: enfa.acceptingToken) {
+                result.acceptingToken[acceptingToken.first + offset] = acceptingToken.second;
+            }
+            for(const auto &transition: enfa.delta) {
+                std::map<char, std::set<State> > temptransition;
+                for(auto &trans: transition.second) {
+                    std::set<State> tempset;
+                    for(auto state: trans.second) {
+                        tempset.insert(state+offset);
+                    }
+                    temptransition[trans.first] = tempset;
+                }
+                result.delta[transition.first + offset] = temptransition;
+            }
+            for(const auto &epsilonTransition: enfa.epsilonTransitions) {
+                std::set<State> tempset;
+                for(State state: epsilonTransition.second) {
+                    tempset.insert(state+offset);
+                }
+                result.epsilonTransitions[epsilonTransition.first + offset] = tempset;
+            }
+            result.epsilonTransitions[0].insert(enfa.starting + offset); 
+            offset += enfa.numStates;
+        }
+        return result;
+    }
+    
 
 } //namespace lxs