avg length = 3.7 len nwords example --- ------ ------------------ 1 614 s 2 3551 o l 3 8812 d a iin 4 7868 o k a iin 5 5952 q o k ee y 6 1786 q o k ee d y 7 192 q o k ee o d y 8 22 q o k o l che d y