• 1 and 2 married, they had a baby 3.
    3 beated up 5, now 5 is 2.
    2 and 3 married, they had a baby 5!
    5 beated up 3, now 3 is -2.
    5 and -2 married, they had a baby 3.
    x introduced 3 to b.
    3 and b had a baby 3b.