Computer Programming Contest Preparation

    1 pretty
    2 women
    3 walking
    4 down
    5 the
    6 street
    7 ab
    8 ba
    9 abc
   10 acd
   11 down
   12 won
   13 prettywoman
   14 walkingdown
   15 inging
   16 singing
   17 abc
   18 
   19 efg
   20 
   21 
   22 ghi
   23 a
   24 a
   25