begin
in p: 1 1
in p: 1 2
in p: 1 3
in p: 2 1
in p: 2 2
in p: 2 3
in p: -5 -6
in p: -44 -55
in p: -77 -88
in q
after p(-77,-88)
after p(-44,-55)
after p(x,y)
after co: -5 -6