ldl++(138)> query p(A,B)
query p(A,B)

Querying : p(A,B) ... 
        (1, 3)
        (2, 3)
        (1, 5.5)
        (2, 5.5)
        (1, 6.5)
        (2, 6.5)

        The number of records is 6.