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:- use_module(library(pengines)). main :- pengine_create([ server('https://pengines.swi-prolog.org'), src_text(" q(X) :- p(X). p(a). p(b). p(c). ") ]), pengine_event_loop(handle, []). handle(create(ID, _)) :- pengine_ask(ID, q(_X), []). handle(success(_ID, [X], false)) :- writeln(X). handle(success(ID, [X], true)) :- writeln(X), pengine_next(ID, []).