def unique(_, __ = type({( )})): __ = type("""
.-=-. .--.
__ .' '. / " )
_ .' '. / .-. \ / .-'\
( \ / .-. \ / / \ \ / / ^
\ `-` / \ `-' / \ `-` /
jgs`-.-` '.____.' `.____.'""", (__,),{'_' :
__.__dict__[filter(lambda _: '_' not in _,
sorted(__.__dict__))[::-1].pop()]})( {( )} ); return [_ for _ in _ if _ not in __ and not __._(_)]
print unique(
"hello world"
)
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