b-p bbb bbh bbk bbo bbp bbs bhb bhh bhk bho bhp bhs bkb bkk bko bkp bks bob boh bok boo bop bos bpb bph bpo bpp bps bsb bsh bsk bso bsp bss hbb hbh hbk hbo hbp hbs hhb hhh hhk hho hhp hhs hkb hkh hkk hko hkp hks hob hoh hok hoo hop hos hpb hph hpk hpo hpp hps hsb hsh hsk hsp hss kbb kbh kbk kbo kbp kbs khh khk kho khs kkb kkh kkk kkp kks kob koh kok koo kop kos kph kpk kpo kpp kps ksb ksh ksk kso ksp kss ob- obb obh obk obo obp obs ohh oho ohp ohs okb okk oko okp oks oo- oob ooh ook ooo oop oos op- opb oph opk opo opp ops os- osb osh osk oso osp oss p-p pbb pbk pbo pbp pbs phb phk pho php phs pkb pko pkp pks pob poh pok poo pop pos ppb pph ppk ppo ppp pps ps- psb psh psk pso psp pss sbb sbh sbk sbo sbp sbs sh- shb shh shk sho shp shs sk- skb skh skk sko skp sks sob soh sok soo sop sos spb sph spk spo spp sps ss- ssb ssh ssk sso ssp sss