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# coding=utf-8 id = 111 number = 18 visible = True facts = None solution = '''\ conc111([], L, L). conc111([H|T], L2, [H|L]) :- conc111(T, L2, L). rev([], []). rev([H|T], R):- rev(T, R1), conc111(R1, [H], R). '''