prolog/problems/denotational_semantics/prog_listswap_2/common.py


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id = 175
number = 79
visible = False
facts = None

solution = '''\
program --> [begin], instructs175, [end].

instructs175 --> instr175.
instructs175 --> instr175, instructs175.

instr175 --> [left].
instr175 --> [right].
instr175 --> [swap].
'''