a aa aaa aaaa b bb bbb bbbb c cc ccc cccc d dd ddd dddd e ee eee eeee f ff fff ffff g gg ggg gggg h hh hhh hhhh j jj jjj jjjj k kk kkk kkkk m mm mmm mmmm n nn nnn nnnn o oo ooo oooo p pp ppp pppp q qq qqq qqqq r rr rrr rrrr s ss sss ssss t tt ttt tttt u uu uuu uuuu v vv vvv vvvv w ww www wwww x xx