b-u bbb bbn bbo bbu bbx bby bnb bnn bno bnu bnx bob bon boo bou box boy bub bun buo buu bux buy bxb bxn bxo bxx by- byn byo byu nbb nbn nbo nbu nbx nnb nnn nno nnu no- nob non noo nou nox noy nub nun nuo nuu nux nuy nyn nyo nyu nyx nyy ob- obb obn obo obu obx oby on- onb onn ono onu onx ony oo- oob oon ooo oox ou- oun ouo ox- oxb oxn oxo oxx oxy oyo ubb ubn ubo ubu ubx uby un- unb unn uno unu unx uny uob uon uoo uox uun uuu uxb uxo uxu uyo uyu xbx xno xnu xon xoo xox xun xxo xxx xxy xyy yby ynn ynu yny yob yon yoo you yox yoy yun yuo yuu yux yuy yxy yyb yyu yyy