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four_crosses :-
prompt("What are the two items to cross?",_Two_items),
cross,cross,cross,
prompt("What is their cross?",_Cross11).
cross :-
prompt("What is their cross?",_Cross11),
prompt("What is at the same level as this?",_Cross12).
prompt(Prompt,String) :-
writeln(Prompt),
read_string(user_input, "\n", "\r", _End, String). |