#NEWLINE# def unique_usecase( src ) : #NEWLINE# #INDENT# seen = set ( ) #NEWLINE# res = [ ] #NEWLINE# for v in src : #NEWLINE# #INDENT# if ( v not in seen ) : #NEWLINE# #INDENT# seen . add ( v ) #NEWLINE# res . append ( src ) #NEWLINE# #UNINDENT# #UNINDENT# return res