Sean Cross wrote: > I would suggest > > If (X = []) or (X = [a]) or (x = [b]) or (X = [a,b]) then... > > But the original code seems fine to me.
What I think is the most direct way of writing it is this:
if X <= [a,b] then
That's checking whether X is a subset of {a,b}.
You could also do this:
if X + [a,b] = [a,b] then
--
Rob
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