i 1 2 -3 0
i -1 -2 3 0
i 2 3 -4 0
i -2 -3 4 0
i 1 3 4 0
i -1 -3 -4 0
i -1 2 4 0
i 1 -2 -4 0
r -4 -1 0
r -1 0
r -3 0
r 4 0
r -2 0
r 0