classes([x,y]).
attributes([a,b,c]).
example(1,x,[a = 1,b =  1,c =  1]).
example(2,y,[a = 1,b =  2,c =  2]).
example(3,y,[a = 2,b =  3,c =  2]).
example(4,x,[a = 2,b =  3,c =  1]).
example(5,y,[a = 1,b =  2,c =  2]).
example(6,x,[a = 1,b =  1,c =  2]).
example(7,x,[a = 1,b =  1,c =  1]).