b-p bbb bbi bbk bbo bbp bbr bi- bib bii bik bio bip bir bkb bkk bko bkp bkr bob boi bok boo bop bor bpb bpi bpo bpp bpr brb bri brk bro brp brr ibb ibi ibk ibo ibp ibr iib iii iio iip iir ikb iki ikk iko ikr io- iob ioi ioo iop ior ipb ipi ipo ipp ipr ir- irb iri irk iro irp irr kbb kbi kbk kbo kbp kbr kib kii kik kio kip kir kkb kki kkk kkp kkr kob koi kok koo kop kor kpi kpk kpo kpp kpr kri krk kro krp krr o-i ob- obb obi obk obo obp obr oib oii oik oio oip oir okb oki okk oko okp okr oo- oob ooi ook ooo oop oor op- opb opi opk opo opp opr or- orb ori ork oro orp orr p-p pbb pbi pbk pbo pbp pbr pib pii pik pio pip pir pkb pki pko pkp pkr pob poi pok poo pop por ppb ppi ppk ppo ppp ppr prb pri prk pro prp prr rbb rbi rbk rbo rbp rbr rib rii rik rio rip rir rkb rkk rko rkp rob roi rok roo rop ror rpb rpi rpk rpo rpp rpr rrb rri rrk rrp rrr