Subset predicate

From: B.r.K.o.N.j.A. (thebrkonja_at_inet.hr)
Date: 12/18/03 

Date: Thu, 18 Dec 2003 11:41:31 +0100

I have trouble with subset predicate, I have written a predicate which
returns a sublist, for example : [1,2] is a sublist of [1,2,3], or [2,3] is
a sublist of [1,2,3], but I need a predicate which will give me true as well
for [1,3] is a subset of [1,2,3], any ideas?

Thanks,

Vedran

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