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cfiles="aaa.c bbb.c ccc.c ddd.c "
sub="aaa.c d.c"
a = set(cfiles.split(' '))
b = set(sub.split(' '))
res = b - (b - a)
print res
cfiles="aaa.c bbb.c ccc.c ddd.c "
sub="aaa.c d.c bbb.c"
sub=sub.split(' ')
cfiles=cfiles.split(' ')
sub=[i for i in sub if i in cfiles ]
print sub
cfiles = 'aaa.c bbb.c ccc.c ddd.c'
sub = 'aaa.c d.c'
sub = set(sub.split(' ')) & set(cfiles.split(' '))
print sub