prolog/problems/dcg/paren_3/common.py


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# coding=utf-8

id = 169
group = 'dcg'
number = 76
visible = True
facts = None

solution = '''\
paren(0) --> [].
paren(D) --> ['('], paren(D1), [')'], paren(D2), { D1 >= D2, D is D1 + 1 ; D1 < D2 , D is D2 }.
'''