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:- module oracle_db.
:- interface.
:- import_module io.

:- pred main(io__state::di, io__state::uo) is det.

:- implementation.

main -->
    (
        { a(99, 99, 99) }
    ->
        io__write_string("yes.\n")
    ;
        io__write_string("no.\n")
    ).

:- pred a(int, int, int).
:- mode a(in, in, in) is semidet.

a(X, Y, Z) :-
    b(X),
    b(Y),
    b(Z).

:- pred b(int).
:- mode b(in) is semidet.

b(99).