test_combinations.c running 
combinations(n=4, m=2, last=0, 1 2 
combinations(n=4, m=2, last=0, 1 3 
combinations(n=4, m=2, last=0, 1 4 
combinations(n=4, m=2, last=0, 2 3 
combinations(n=4, m=2, last=0, 2 4 
combinations(n=4, m=2, last=1, 3 4 

combinations(n=6, m=3, last=0, 1 2 3 
combinations(n=6, m=3, last=0, 1 2 4 
combinations(n=6, m=3, last=0, 1 2 5 
combinations(n=6, m=3, last=0, 1 2 6 
combinations(n=6, m=3, last=0, 1 3 4 
combinations(n=6, m=3, last=0, 1 3 5 
combinations(n=6, m=3, last=0, 1 3 6 
combinations(n=6, m=3, last=0, 1 4 5 
combinations(n=6, m=3, last=0, 1 4 6 
combinations(n=6, m=3, last=0, 1 5 6 
combinations(n=6, m=3, last=0, 2 3 4 
combinations(n=6, m=3, last=0, 2 3 5 
combinations(n=6, m=3, last=0, 2 3 6 
combinations(n=6, m=3, last=0, 2 4 5 
combinations(n=6, m=3, last=0, 2 4 6 
combinations(n=6, m=3, last=0, 2 5 6 
combinations(n=6, m=3, last=0, 3 4 5 
combinations(n=6, m=3, last=0, 3 4 6 
combinations(n=6, m=3, last=0, 3 5 6 
combinations(n=6, m=3, last=1, 4 5 6 

many cases n=6, m=0 to 7 
bad parameters to comb, n=6, m=0
combinations(n=6, m=0,  0

combinations(n=6, m=1,  1
combinations(n=6, m=1,  2
combinations(n=6, m=1,  3
combinations(n=6, m=1,  4
combinations(n=6, m=1,  5
combinations(n=6, m=1,  6

combinations(n=6, m=2,  1 2
combinations(n=6, m=2,  1 3
combinations(n=6, m=2,  1 4
combinations(n=6, m=2,  1 5
combinations(n=6, m=2,  1 6
combinations(n=6, m=2,  2 3
combinations(n=6, m=2,  2 4
combinations(n=6, m=2,  2 5
combinations(n=6, m=2,  2 6
combinations(n=6, m=2,  3 4
combinations(n=6, m=2,  3 5
combinations(n=6, m=2,  3 6
combinations(n=6, m=2,  4 5
combinations(n=6, m=2,  4 6
combinations(n=6, m=2,  5 6

combinations(n=6, m=3,  1 2 3
combinations(n=6, m=3,  1 2 4
combinations(n=6, m=3,  1 2 5
combinations(n=6, m=3,  1 2 6
combinations(n=6, m=3,  1 3 4
combinations(n=6, m=3,  1 3 5
combinations(n=6, m=3,  1 3 6
combinations(n=6, m=3,  1 4 5
combinations(n=6, m=3,  1 4 6
combinations(n=6, m=3,  1 5 6
combinations(n=6, m=3,  2 3 4
combinations(n=6, m=3,  2 3 5
combinations(n=6, m=3,  2 3 6
combinations(n=6, m=3,  2 4 5
combinations(n=6, m=3,  2 4 6
combinations(n=6, m=3,  2 5 6
combinations(n=6, m=3,  3 4 5
combinations(n=6, m=3,  3 4 6
combinations(n=6, m=3,  3 5 6
combinations(n=6, m=3,  4 5 6

combinations(n=6, m=4,  1 2 3 4
combinations(n=6, m=4,  1 2 3 5
combinations(n=6, m=4,  1 2 3 6
combinations(n=6, m=4,  1 2 4 5
combinations(n=6, m=4,  1 2 4 6
combinations(n=6, m=4,  1 2 5 6
combinations(n=6, m=4,  1 3 4 5
combinations(n=6, m=4,  1 3 4 6
combinations(n=6, m=4,  1 3 5 6
combinations(n=6, m=4,  1 4 5 6
combinations(n=6, m=4,  2 3 4 5
combinations(n=6, m=4,  2 3 4 6
combinations(n=6, m=4,  2 3 5 6
combinations(n=6, m=4,  2 4 5 6
combinations(n=6, m=4,  3 4 5 6

combinations(n=6, m=5,  1 2 3 4 5
combinations(n=6, m=5,  1 2 3 4 6
combinations(n=6, m=5,  1 2 3 5 6
combinations(n=6, m=5,  1 2 4 5 6
combinations(n=6, m=5,  1 3 4 5 6
combinations(n=6, m=5,  2 3 4 5 6

combinations(n=6, m=6,  1 2 3 4 5 6

bad parameters to comb, n=6, m=7
combinations(n=6, m=7,  1 2 3 4 5 6 1

check unchanged v6=1 2 3 4 5 6
end test_combinations.c