def cross(a, b):
    return [((a[1] * b[2]) - (a[2] * b[1])), ((a[2] * b[0]) - (a[0] * b[2])), ((a[0] * b[1]) - (a[1] * b[0]))]
def cross(a, b):
    return [((a[1] * b[2]) - (a[2] * b[1])), ((a[2] * b[0]) - (a[0] * b[2])), ((a[0] * b[1]) - (a[1] * b[0]))]