b-p bbb bbi bbo bbp bbr bbs bby bi- bib bii bio bip bir bis biy bob boi boo bop bor bos boy bpb bpi bpo bpp bpr bps bpy brb bri bro brp brr brs bry bsb bsi bso bsp bsr bss bsy by- byi byo byp byr bys ibb ibi ibo ibp ibr ibs iby iib iii iio iip iir iis io- iob ioi ioo iop ior ios ipb ipi ipo ipp ipr ips ipy ir- irb iri iro irp irr irs iry is- isb isi iso isp isr iss isy iyo iyr iys iyy o-i ob- obb obi obo obp obr obs oby oib oii oio oip oir ois oo- oob ooi ooo oop oor oos op- opb opi opo opp opr ops opy or- orb ori oro orp orr ors ory os- osb osi oso osp osr oss oyi oyo oys p-p pbb pbi pbo pbp pbr pbs pby pib pii pio pip pir pis pob poi poo pop por pos poy ppb ppi ppo ppp ppr pps prb pri pro prp prr prs pry ps- psb psi pso psp psr pss psy py- pyb pyo pyr pys rbb rbi rbo rbp rbr rbs rib rii rio rip rir ris riy rob roi roo rop ror ros roy rpb rpi rpo rpp rpr rps rrb rri rrp rrr rrs rsb rsi rso rsp rsr rss ry- ryo ryr rys ryy sbb sbi sbo sbp sbr sbs sby sib sii sio sip sir sis sob soi soo sop sor sos soy spb spi spo spp spr sps spy sr- srb sri sro srp srr srs sry ss- ssb ssi sso ssp ssr sss sy- syb syi syp syr sys ybi ybp ybr ybs yby yii yio yip yir yis yob yoi yoo yop yor yos yoy ypo yps yro yrp yrs ysb ysi yso ysp ysr yss ysy yyb yys yyy