% FILE:  tribondx1.pro

% IMPORT COMPARISONS CODE
:- consult('comparisons.pro').

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

reach1(S,D) :-
   isa(S,D).
reach1(S,D) :-
   has(S,D).
reach1(S,D) :-
   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),
   tribond(SC1,SC2,SC3,CC),
   write(tribond(SC1,SC2,SC3,CC)),nl,
   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).