b-p bbb bbd bbi bbk bbo bbp bbs bdb bdd bdi bdk bdo bdp bds bi- bib bid bii bik bio bip bis bkb bkk bko bkp bks bob bod boi bok boo bop bos bpb bpd bpi bpo bpp bps bsb bsd bsi bsk bso bsp bss dbb dbd dbi dbk dbo dbp dbs ddb ddd ddi ddk ddo ddp dds di- dib did dii dik dio dip dis dkb dki dkk dko dkp dks dob dod doi dok doo dop dos dpb dpd dpi dpk dpo dpp dps dsb dsd dsi dsk dso dsp dss i-d ibb ibd ibi ibk ibo ibp ibs idb idd idi idk ido idp ids iib iid iii iio iip iis ikb iki ikk iko iks io- iob iod ioi ioo iop ios ipb ipd ipi ipo ipp ips is- isb isd isi isk iso isp iss kbb kbd kbi kbk kbo kbp kbs kdb kdk kdo kdp kds kib kid kii kik kio kip kis kkb kki kkk kkp kks kob kod koi kok koo kop kos kpd kpi kpk kpo kpp kps ksb ksd ksi ksk kso ksp kss o-i ob- obb obd obi obk obo obp obs odb odd odi odo odp ods oib oid oii oik oio oip ois okb okd oki okk oko okp oks oo- oob ood ooi ook ooo oop oos op- opb opd opi opk opo opp ops os- osb osd osi osk oso osp oss p-p pbb pbd pbi pbk pbo pbp pbs pdb pdd pdi pdk pdo pdp pds pib pid pii pik pio pip pis pkb pkd pki pko pkp pks pob pod poi pok poo pop pos ppb ppd ppi ppk ppo ppp pps ps- psb psd psi psk pso psp pss sbb sbd sbi sbk sbo sbp sbs sdb sdd sdi sdk sdo sdp sds sib sid sii sik sio sip sis sk- skb skd ski skk sko skp sks sob sod soi sok soo sop sos spb spd spi spk spo spp sps ss- ssb ssd ssi ssk sso ssp sss