llvm/polly/lib/External/isl/test_inputs/convex14.polylib

3 4
0 1 0 2
1 0 1 0
1 0 -1 2

3 4
1 1 0 0
1 0 1 0
1 0 -1 2

3 4
1 1 0 2
1 0 1 0
1 0 -1 2