output(X,Y) :- my_output(X,Y)!.

my_output(X,Y) :- my_output_(X,Y);
my_output_(X,Y) :- my_output__(X,Y);
my_output__(X,Y) :- my_output___(X,Y);
my_output___(X,Y) :- write([X | [is | [Y | []]]]), my_________().
my_________() :- my________().
my________() :- my_______().
my_______() :- my______().
my______() :- my_____().
my_____() :- my____().
my____() :- my___().
my___() :- my__().
my__() :- my_().
my_() :- my().
my() :- !.