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a=lambda x:sum(i for i in xrangerange(1,x)if not x%ix%i<1) b=lambda x:x==a(a(x))
a=lambda x:sum(i for i in xrange(1,x)if not x%i) b=lambda x:x==a(a(x))
a=lambda x:sum(i for i in range(1,x)if x%i<1) b=lambda x:x==a(a(x))
