arms = tile.arms
tri_n = sum(arms) - 1
flags = 0
for i in arm_range:
    flags |= (2 ** i) if arms[i] else 0

k = (tri_n ** 2 + tri_n) / 2
angles = [0]*k

i = 0
while flags:
    if flags & 0x01:
        for j in arm_range[1:NUM_ARMS - i]:
            if (flags & (2**j)):
                k -= 1
                angles[k] = angle_lut[i][i+j]
    i += 1
    flags /= 2