- sequence(:Element, ?List)// is nondet
- Match or generate a sequence of Element. This predicate is
deterministic if List is fully instantiated and Element is
deterministic. When parsing, this predicate is gready and does not
prune choice points. For example:
?- phrase(sequence(digit, Digits), `123a`, L). Digits = "123", L = [97] ; Digits = [49, 50], L = [51, 97] ; ...