learn-prolog-now-exercises
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chapter-11 subset problem
cd chapter-11
swipl practical-session.pl
powerset([a,b,c,d,e],P).
P = [[], [a], [a, b], [a, b, c], [a, b, c, d], [a, b, c|...], [a, b|...], [a|...], [...|...]|...].