-er bbb bbe bbh bbo bbr bbs be- beb bee beh beo ber bes bhb bhe bhh bho bhr bhs bob boe boh boo bor bos brb bre brh bro brr brs bsb bse bsh bso bsr bss ebb ebe ebh ebo ebr ebs eeb eee eeo eer ees ehb ehe ehh eho ehr ehs eo- eob eoe eoh eoo eor eos erb ere erh ero err ers es- esb ese esh eso esr ess hbb hbe hbh hbo hbr hbs he- heb hee heh heo her hes hhb hhe hhh hho hhr hhs hob hoe hoh hoo hor hos hr- hrb hre hrh hro hrr hrs hsb hse hsh hsr hss ob- obb obe obh obo obr obs oeb oee oeh oeo oer oes ohe ohh oho ohr ohs oo- oob ooh ooo oor oos or- orb ore orh oro orr ors os- osb ose osh oso osr oss rbb rbe rbh rbo rbr rbs re- reb ree reh reo rer res rh- rhb rhe rhh rho rhr rhs rob roe roh roo ror ros rrb rrh rrr rrs rsb rse rsh rso rsr rss sbb sbe sbh sbo sbr sbs se- seb see seh seo ser ses sh- shb she shh sho shr shs sob soe soh soo sor sos sr- srb sre srh sro srr srs ss- ssb sse ssh sso ssr sss