b-p bbb bbi bbo bbp bbr bby bi- bib bii bio bip bir biy bob boi boo bop bor boy bpb bpi bpo bpp bpr bpy brb bri bro brp brr bry by- byi byo byp byr ibb ibi ibo ibp ibr iby iib iii iio iip iir io- iob ioi ioo iop ior ipb ipi ipo ipp ipr ipy ir- irb iri iro irp irr iry iyo iyr iyy o-i ob- obb obi obo obp obr oby oib oii oio oip oir oo- oob ooi ooo oop oor op- opb opi opo opp opr opy or- orb ori oro orp orr ory oyi oyo p-p pbb pbi pbo pbp pbr pby pib pii pio pip pir pob poi poo pop por poy ppb ppi ppo ppp ppr prb pri pro prp prr pry py- pyb pyo pyr rbb rbi rbo rbp rbr rib rii rio rip rir riy rob roi roo rop ror roy rpb rpi rpo rpp rpr rrb rri rrp rrr ry- ryo ryr ryy ybi ybp ybr yby yii yio yip yir yob yoi yoo yop yor yoy ypo yro yrp yyb yyy