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Pack dialect-ciao -- prolog/dialect/ciao/lists.pl
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 nth(?Index, ?List, ?Element) is nondet
True if Element is the N-th element in List. Counting starts at 1.
- use nth1/3.
 list_insert(-List, +Term)
Adds Term to the end of List if there is no element in List identical to Term.
 sublist(?List1, +List2)
List2 contains all the elements of List1.