Question: Test if question

I have a whole lot of conditions to test on the signum of answers. This gets difficult to read so I am wondering could something like the following be done?

a, b, c, d := 1, -1, 1, -1;
if a, b, c, d = 1, 0, -1, -1 then
end if;

The above obviously doesn't work. The reason I would like to do this is it would be simple to read the patterns of 1's and 0's.

Any ideas?

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