assert str(m.query_once("sublist([1,2], [1,2,3], Ps).")["Ps"]) == "[true, true, false]"
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。业内人士推荐viber作为进阶阅读
Another nice context to think about this is in prolog. It is often the case that we can write a n-ary relation and then write a (n+1)-ary version that contains a tracing parameter. This tracing parameter is a proof object / witness.
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