bbbb bbbs bbeb bbpr bebb bebe bebi beeb beej beep beer bees beij beir beis bere beri berr bers bes- bese bess bibb bibe bibi bibs bieb bier bies biis biji bijs bipp bips birb bire biri birr birs bis- bise bisp biss bjps breb bree brei brep brer bres brie bris brje brrr brrs brsb brsr bseb bsee bser bses bspp bspr bsse ebbr ebbs eber ebes ebis eeee eees eeps eers eese eesi eiei eier eies eiji eipr eire eirs eise eiss ejer ejji epee eper epes epi- epie epip epis eppp epps eprb eprp eprs epsi epsp epss erbb erbe ereb erei erer eres erie eris erpe erps erre errs erse ersi esbs esee eser eses esie esis espe espi espp esps esri esse essi essp i-be ibes ibie ibis ibri ibss ieie iere ieri iers iesi iesr iies iiie iiii iiis iirs iisi iisj iisp iisr ijji iper ipes ipie ippr ipri ipse ipsi ipsp ipss irbe irbp iree irer ires iri- irie irip iris irje irpe irps irre irri irrs irse irsp isbe iseb isee isep iser ises isie isis ispe ispr isps isri isrp isse issi issp issr isss jebb jebe jeep jeer jees jeps jere jeri jers jese jess jibb jibe jibi jibs jije jiji jipe jiri jpip jrbr jssp jssr jsss pbjs pbrs pbsp peep peer pees peip peir peis peje pepe pepi peps per- pere peri perp perr pers pese pesi pess pibb pibi piep pier pies piip pipe pipi pipp pips pire piri pirr pirs pise pisi piss pper ppib ppie pppp ppps ppss prbs pre- preb pree prep pres pri- prie prii pris prps prri prrs prse prsi prss psbr pseb psei psip psis pspi pspp pspr psps psrp psse rbbb rbbr rbbs rbis rbpj rbsp rbss rebb rebe rebs reeb reep rees reii reir reis repe repi repp repr reps rere reri rers rese resi resp ress rib- ribe ribs riep rier ries riis riji rijp rijs ripe ripi ripp ripr rips rire riri rirs rise risi risp riss rpii rpps rrrr rrsp rsbi rsee rsis rspb rsps rsre s-ib s-ii sbbs sber sbse sbsi sbsp se-e se-i se-s sebe sebi sebs seeb seep seer sees seie seii seip seir seis sepe sepi sepp sepr seps serb sere seri serj serp serr sers sese sesi sess sibe sibi sibs sier sies sipe sipi sipp sips sire siri sirp sirr sirs sise sisi siss sjis speb spee sper spes spib spie spip spir spis spps spri sprs spse spsp spss sreb sres srib sris srps srsp ssbr ssee ssep sses ssis sspe ssps ssri ssrs sssb sssi ssss