b-p bbb bbe bbi bbk bbo bbp bbs be- beb bee bei bek beo bep bes bi- bib bie bii bik bio bip bis bkb bke bkk bko bkp bks bob boe boi bok boo bop bos bpb bpe bpi bpo bpp bps bsb bse bsi bsk bso bsp bss ebb ebe ebi ebk ebo ebp ebs eeb eee eek eeo eep ees eib eie eii eik eio eip eis ekb eke eki eko ekp eks eo- eob eoe eoi eok eoo eop eos ep- epb epe epi epo epp eps es- esb ese esi esk eso esp ess ibb ibe ibi ibk ibo ibp ibs ie- iee iei iek iep ies iib iie iii iio iip iis ikb ike iki ikk iko iks io- iob ioe ioi ioo iop ios ipb ipe ipi ipo ipp ips is- isb ise isi isk iso isp iss kbb kbe kbi kbk kbo kbp kbs ke- keb kee kei kek keo kep kes kib kie kii kik kio kip kis kkb kke kki kkk kkp kks kob koe koi kok koo kop kos kpe kpi kpk kpo kpp kps ksb kse ksi ksk kso ksp kss o-i ob- obb obe obi obk obo obp obs oeb oee oei oeo oep oes oib oie oii oik oio oip ois okb oke oki okk oko okp oks oo- oob ooi ook ooo oop oos op- opb ope opi opk opo opp ops os- osb ose osi osk oso osp oss p-p pbb pbe pbi pbk pbo pbp pbs peb pee pei pek peo pep pes pib pie pii pik pio pip pis pkb pke pki pko pkp pks pob poe poi pok poo pop pos ppb ppe ppi ppk ppo ppp pps ps- psb pse psi psk pso psp pss sbb sbe sbi sbk sbo sbp sbs se- seb see sei sek seo sep ses sib sie sii sik sio sip sis sk- skb ske ski skk sko skp sks sob soe soi sok soo sop sos spb spe spi spk spo spp sps ss- ssb sse ssi ssk sso ssp sss