p = [1, 3, 2]
present = 1
po = [1, 3, 2]

p = [1, 3, 2.00001]
present = 1
po = [1, 3, 2]

p = [1, 1, 7]
present = 0

p = [1, 1, 5]
present = 1
po = [1, 1, 5]

p = [4, 5, 8]
present = 0

p = [4, 5, 6]
present = 1
po = [4, 5, 6]