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### Meeting Point SICStus

 ```%% meeting.pl % sicstus --goal "main(meetingins), halt." -l meeting :- use_module(library(between)). main(File) :- [File], board(Size), MaxX = Size, MaxY = Size, findall(number(X,Y,N),number(X,Y,N),Nums), between(1,MaxX,MX), between(1,MaxY,MY), \+ member(number(MX,MY,_),Nums), Visited = [], route(Nums,MX,MY,Visited,Plan), output_links(Plan). route([number(X,Y,N)|Nums],MX,MY,Visited,Plan) :- \+ member((X,Y),Visited), route(X,Y,X,Y,N,MX,MY,[(X,Y)|Visited],Visited1,Plan,Plan1), route(Nums,MX,MY,Visited1,Plan1). route([],_MX,_MY,_Visited,Plan) :- Plan=[]. route(_PX,_PY,X,Y,N,X,Y,Visited,Visited1,Plan,PlanR) :- N=0, Plan=PlanR, Visited1=Visited. route(PX,PY,X,Y,N,MX,MY,Visited,Visited1,Plan,PlanR) :- Xm1 is X-1, Xp1 is X+1, Ym1 is Y-1, Yp1 is Y+1, member((X1,Y1),[(X,Ym1),(X,Yp1),(Xm1,Y),(Xp1,Y)]), cell(X1,Y1), \+ member((X1,Y1),Visited), Plan = [link(X,Y,X1,Y1)|Plan1], (X1\==PX, Y1\==PY -> N1 is N-1, N1 >= 0 ; N1 = N ), ((X1,Y1) = (MX,MY) -> TmpVisited=Visited; TmpVisited = [(X1,Y1)|Visited]), route(X,Y,X1,Y1,N1,MX,MY,TmpVisited,Visited1,Plan1,PlanR). cell(X,Y) :- board(N), X >= 1, X =< N, Y >= 1, Y =< N. output_links([]). output_links([Link|L]) :- portray_clause(Link), output_links(L).```