SWI-Prolog -- call

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Predicate call_delays/2

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  - Tabled execution (SLG resolution)
    - Well Founded Semantics
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Availability::- use_module(library(wfs)).(can be autoloaded)

call_delays(:Goal, -Condition)

True when Goal is an answer that is true when Condition can be satisfied. If Condition is true, Answer is unconditional. Otherwise it is a conjunction of goals, each of which is associated with a tabled predicate.