b-p bbb bbh bbo bbp bbs bhb bhh bho bhp bhs bob boh boo bop bos bpb bph bpo bpp bps bsb bsh bso bsp bss hbb hbh hbo hbp hbs hhb hhh hho hhp hhs hob hoh hoo hop hos hpb hph hpo hpp hps hsb hsh hsp hss ob- obb obh obo obp obs ohh oho ohp ohs oo- oob ooh ooo oop oos op- opb oph opo opp ops os- osb osh oso osp oss p-p pbb pbo pbp pbs phb pho php phs pob poh poo pop pos ppb pph ppo ppp pps ps- psb psh pso psp pss sbb sbh sbo sbp sbs sh- shb shh sho shp shs sob soh soo sop sos spb sph spo spp sps ss- ssb ssh sso ssp sss