llvm/polly/lib/External/isl/test_inputs/codegen/pldi2012/figure8_b.in

[n] -> { s0[i] -> [i] : exists alpha: 1 <= i <= n and i = 4 alpha;
	 s1[i] -> [i] : exists alpha: 1 <= i <= n and i = 4 alpha + 2 }
[n] -> { : }
[n] -> { [*] -> separate[x] : x >= 0 }