-module(helloworld). 
-export([start/0]). 

start() ->
   Lst1=[{"a",1},{"b",2},{"c",3}], 
   Lst2=[{"d",4},{"e",5},{"f",6}], 
   Map1 = maps:from_list(Lst1), 
   Map2 = maps:from_list(Lst2), 
   io:fwrite("~p~n",[maps:merge(Map1,Map2)]).