[(e f g a b c)]
[(e f g)]
[(a b c)]
[()]
[(2 1)]
[(5 4 3 2)]
[(9 8 7 6 5 4 3 2 1)]
21.27user 0.02system 0:21.30elapsed 99%CPU (0avgtext+0avgdata 37228maxresident)k
0inputs+0outputs (0major+4410minor)pagefaults 0swaps