% GENERAL INFORMATION
% File:  colors.pro
% Line:  Knowledge base containing color facts.

% DATA DICTIONARY
% primary(C) :: C is a primary color
% secondary(C) :: C is a secondary color
% other(C) :: C is an nonprimary/nonsecondary color
% mix(P1,P2,S) :: P1 and P2 can be mixed to make S
% color(C) :: C is a color

% THE KNOWLEDGE BASE ...

primary(red).
primary(blue).
primary(yellow).

secondary(orange).
secondary(purple).
secondary(green).

other(aqua).
other(mauve).
other(magenta).
other(pink).
other(gray).
other(coral).
other(crimson).
other(beige).
other(chartreuse).
other(fuchsia).
other(gold).
other(olivedrab).

mix(blue,red,purple).
mix(red,yellow,orange).
mix(blue,yellow,green).
mix(P1,P2,Secondary) :- mix(P2,P1,Secondary).

color(C) :- primary(C).
color(C) :- secondary(C).
color(C) :- other(C).

% END OF KNOWLEDGE BASE