-er b-p bbb bbe bbh bbo bbp bbr bbs be- beb bee beh beo bep ber bes bhb bhe bhh bho bhp bhr bhs bob boe boh boo bop bor bos bpb bpe bph bpo bpp bpr bps brb bre brh bro brp brr brs bsb bse bsh bso bsp bsr bss ebb ebe ebh ebo ebp ebr ebs eeb eee eeo eep eer ees ehb ehe ehh eho ehp ehr ehs eo- eob eoe eoh eoo eop eor eos ep- epb epe eph epo epp epr eps erb ere erh ero erp err ers es- esb ese esh eso esp esr ess hbb hbe hbh hbo hbp hbr hbs he- heb hee heh heo hep her hes hhb hhe hhh hho hhp hhr hhs hob hoe hoh hoo hop hor hos hpb hpe hph hpo hpp hpr hps hr- hrb hre hrh hro hrp hrr hrs hsb hse hsh hsp hsr hss ob- obb obe obh obo obp obr obs oeb oee oeh oeo oep oer oes ohe ohh oho ohp ohr ohs oo- oob ooh ooo oop oor oos op- opb ope oph opo opp opr ops or- orb ore orh oro orp orr ors os- osb ose osh oso osp osr oss p-p pbb pbe pbo pbp pbr pbs peb pee peh peo pep per pes phb phe pho php phr phs pob poe poh poo pop por pos ppb ppe pph ppo ppp ppr pps prb pre prh pro prp prr prs ps- psb pse psh pso psp psr pss rbb rbe rbh rbo rbp rbr rbs re- reb ree reh reo rep rer res rh- rhb rhe rhh rho rhp rhr rhs rob roe roh roo rop ror ros rpb rpe rph rpo rpp rpr rps rrb rrh rrp rrr rrs rsb rse rsh rso rsp rsr rss sbb sbe sbh sbo sbp sbr sbs se- seb see seh seo sep ser ses sh- shb she shh sho shp shr shs sob soe soh soo sop sor sos spb spe sph spo spp spr sps sr- srb sre srh sro srp srr srs ss- ssb sse ssh sso ssp ssr sss