For given two lines s1 and s2, print "2" if they are parallel, "1" if they are orthogonal, or "0" otherwise.
s1 crosses points p0 and p1, and s2 crosses points p2 and p3.
The entire input looks like:
q (the number of queries) 1st query 2nd query ... qth query
Each query consists of integer coordinates of the points p0, p1, p2, p3 in the following format:
x_{p0} y_{p0} x_{p1} y_{p1} x_{p2} y_{p2} x_{p3} y_{p3}
For each query, print "2", "1" or "0".
3 0 0 3 0 0 2 3 2 0 0 3 0 1 1 1 4 0 0 3 0 1 1 2 2
2 1 0