bbb bbi bbk bbo bbr bby bi- bib bii bik bio bir biy biz bkb bkk bko bkr bob boi bok boo bor boy boz brb bri brk bro brr bry brz by- byi byk byo byr byz bzo bzr bzz ibb ibi ibk ibo ibr iby ibz iib iii iio iir ikb iki ikk iko ikr io- iob ioi ioo ior ir- irb iri irk iro irr iry iyo iyr iyy izi izo izy izz k-z kbb kbi kbk kbo kbr kbz kib kii kik kio kir kiz kkb kki kkk kkr kky kob koi kok koo kor koy koz kri krk kro krr kry kyo kyr kyz kzo kzy o-i ob- obb obi obk obo obr oby oib oii oik oio oir oiz okb oki okk oko okr oo- oob ooi ook ooo oor or- orb ori ork oro orr ory orz oyi oyo ozo ozz rbb rbi rbk rbo rbr rib rii rik rio rir riy riz rkb rkk rko rky rkz rob roi rok roo ror roy roz rrb rri rrk rrr ry- ryk ryo ryr ryy ryz rzb rzo rzy ybi ybr yby ybz yii yio yir yiz yki ykk yob yoi yok yoo yor yoy yro yyb yyy yyz yzb yzr yzy zbb zbr zby zib zik zio zir ziz zo- zob zoi zok zoo zor zro zzr zzy zzz