b-p bbb bbi bbo bbp bbr bbt bby bi- bib bii bio bip bir bit biy bob boi boo bop bor bot boy bpb bpi bpo bpp bpr bpt bpy brb bri bro brp brr brt bry btb bti bto btp btr btt bty by- byi byo byp byr byt ibb ibi ibo ibp ibr ibt iby iib iii iio iip iir iit io- iob ioi ioo iop ior iot ipb ipi ipo ipp ipr ipt ipy ir- irb iri iro irp irr irt iry itb iti ito itp itt ity iyo iyr iyt iyy o-i ob- obb obi obo obp obr obt oby oib oii oio oip oir oit oo- oob ooi ooo oop oor oot op- opb opi opo opp opr opt opy or- orb ori oro orp orr ort ory ot- otb oti oto otp otr ott oyi oyo p-p pbb pbi pbo pbp pbr pbt pby pib pii pio pip pir pit pob poi poo pop por pot poy ppb ppi ppo ppp ppr ppt prb pri pro prp prr prt pry pt- ptb pti pto ptp ptr ptt pty py- pyb pyo pyr pyt rbb rbi rbo rbp rbr rbt rib rii rio rip rir rit riy rob roi roo rop ror rot roy rpb rpi rpo rpp rpr rpt rrb rri rrp rrr rrt rtb rti rto rtp rtr rtt rty ry- ryo ryr ryy tbb tbi tbo tbp tbr tbt tib tii tio tip tir tit tiy to- tob toi too top tor tot toy tpb tpi tpo tpp tpr tpt trb tri tro trp trr trt try ttb tti tto ttp ttr ttt tty tyo typ tyr tyt ybi ybp ybr yby yii yio yip yir yit yob yoi yoo yop yor yot yoy ypo yro yrp yrt yto ytp ytr ytt yyb yyt yyy