% FILE:  tribondx3.pro

% IMPORT GLOBAL VARIABLE DATA TYPE
:- consult('gv.pro').
% IMPORT COMPARISONS CODE
:- consult('comparisons.pro').

% EXTENDED TRIBOND SOLVER
xtribond(A,B,C) :- 
    declare(count,0),
    tribond(A,B,C,_,Solution),
    valueOf(count,Count),
    write(Solution),write(' count='),write(Count),nl,
    undeclare(count).
xtribond(_,_,_) :- 
    undeclare(count).

% TRIBOND SOLVER
tribond(X,Y,Z,CC,tribond(R1,R2,R3)) :- 
   reach1(X,CC,R1),
   reach1(Y,CC,R2),
   reach1(Z,CC,R3).

reach1(S,D,isa(S,D)) :-
   inc(count),isa(S,D).
reach1(S,D,has(S,D)) :-
   inc(count),has(S,D).
reach1(S,D,vip(S,D)) :-
   inc(count),vip(S,D).

% FIND ALL PROBLEMS
problems :-
   concepts(SC1,SC2,SC3),
   distinct(SC1,SC2,SC3),
   ordered(SC1,SC2,SC3),
   write(problem(SC1,SC2,SC3)),nl,
   fail.
problems.

% FIND ALL TRIBONDS
tribonds :-
   concepts(SC1,SC2,SC3),
   distinct(SC1,SC2,SC3),
   ordered(SC1,SC2,SC3),
   xtribond(SC1,SC2,SC3),
   fail.
tribonds.

concepts(A,B,C) :-
   concept(A),concept(B),concept(C).

distinct(A,B,C) :-
   not(A=B),not(A=C),not(B=C).

ordered(A,B,C) :-
   aless(A,B),aless(B,C).