b-u bbb bbi bbo bbt bbu bi- bib bii bio bit biu bob boi boo bot bou btb bti bto btt btu bub bui buo but buu ibb ibi ibo ibt ibu iib iii iio iit iiu io- iob ioi ioo iot iou itb iti ito itt itu iu- iub iui iut o-i ob- obb obi obo obt obu oib oii oio oit oiu oo- oob ooi ooo oot ot- otb oti oto ott otu ou- oui ouo out tbb tbi tbo tbt tbu tib tii tio tit tiu to- tob toi too tot tou ttb tti tto ttt ttu tub tui tuo tut tuu ubb ubi ubo ubt ubu uib uii uio uit uiu uob uoo uot utb uti uto utt utu uut uuu