def strlist_union(a, b):
 temp = cidict()
 for elt in a:
  temp[elt] = elt
 for elt in b:
  temp[elt] = elt
 return temp.values()

def strlist_union ( a , b ) : temp = cidict ( ) for elt in a : temp [ elt ] = elt for elt in b : temp [ elt ] = elt return temp . values ( )
return union of two lists of case-insensitive strings a .