Nart27 has post the 10 test cases of this problem.

I got wrong answer of test10, following is the comparison between my result and contents of Nart27's "phone9.out":

________________________________phone9.out
abbacc eeeddfd rrspps uuuvvtt xwwwwx zqooozq wyywxwy tuvvvu sprrrrp ffefed ababbab
222222 3333333 777777 8888888 999999 0000000 9999999 888888 7777777 333333 2222222

________________________________my result
222222 3333333 777777 8888888 999999 0000000 9999999 888888 7777777 333333 2222222
ccacbb eeddfed ppsrpr vvvuuuv ywwyxx zzzoqoo xxxwxxw tvuvvt prppspr deedde baccabc
________________________________


Thers are sentences like this in the problem description:
"If there are more solutions having the minimum number of words, you can choose any single one of them."
can anybody tell me is it really the case?