-er bbb bbe bbi bbk bbo bbr bbs bbt bbx be- beb bee bei bek beo ber bes bet bex bi- bib bie bii bik bio bir bis bit bix bkb bke bkk bko bkr bks bkt bkx bob boe boi bok boo bor bos bot box brb bre bri brk bro brr brs brt brx bsb bse bsi bsk bso bsr bss bst bsx btb bte bti btk bto btr bts btt btx bxb bxi bxo bxx ebb ebe ebi ebk ebo ebr ebs ebt ebx eeb eee eek eeo eer ees eet eex eib eie eii eik eio eir eis eit eix ekb eke eki eko ekr eks ekt eo- eob eoe eoi eok eoo eor eos eot erb ere eri erk ero err ers ert es- esb ese esi esk eso esr ess est esx etb ete eti etk eto etr ets ett etx ex- exe exi exo exr exs ext exx ibb ibe ibi ibk ibo ibr ibs ibt ibx ie- iee iei iek ier ies iet iex iib iie iii iio iir iis iit iix ikb ike iki ikk iko ikr iks ikt ikx io- iob ioe ioi ioo ior ios iot ir- irb ire iri irk iro irr irs irt irx is- isb ise isi isk iso isr iss ist itb ite iti itk ito its itt itx ixe ixi k-t kbb kbe kbi kbk kbo kbr kbs kbx ke- keb kee kei kek keo ker kes ket kex kib kie kii kik kio kir kis kit kix kkb kke kki kkk kkr kks kkt kob koe koi kok koo kor kos kot kri krk kro krr krs krt ksb kse ksi ksk kso ksr kss kst ktb kte ktk kto ktr kts ktt kxo o-i ob- obb obe obi obk obo obr obs obt obx oeb oee oei oeo oer oes oet oex oib oie oii oik oio oir ois oit okb oke oki okk oko okr oks oo- oob ooi ook ooo oor oos oot oox or- orb ore ori ork oro orr ors ort orx os- osb ose osi osk oso osr oss ost osx ot- otb ote oti otk oto otr ots ott ox- oxb oxi oxo oxt oxx rbb rbe rbi rbk rbo rbr rbs rbt rbx re- reb ree rei rek reo rer res ret rex rib rie rii rik rio rir ris rit rix rkb rke rkk rko rks rkt rob roe roi rok roo ror ros rot rox rrb rri rrk rrr rrs rrt rsb rse rsi rsk rso rsr rss rst rsx rtb rte rti rtk rto rtr rts rtt rtx rxr rxs sbb sbe sbi sbk sbo sbr sbs sbt sbx se- seb see sei sek seo ser ses set sex sib sie sii sik sio sir sis sit six sk- skb ske ski skk sko skr sks skt skx sob soe soi sok soo sor sos sot sox sr- srb sre sri srk sro srr srs srt srx ss- ssb sse ssi ssk sso ssr sss sst ssx stb ste sti stk sto str sts stt stx sxi sxs sxt t-x tbb tbe tbi tbk tbo tbr tbs tbt te- teb tee tei tek teo ter tes tet tex tib tie tii tik tio tir tis tit tix tkb tke tkk tko tkr tks tkt to- tob toe toi tok too tor tos tot tox trb tre tri trk tro trr trs trt trx tsb tse tsi tsk tso tsr tss tst tsx ttb tte tti ttk tto ttr tts ttt ttx txe txi txk txs txt xbe xbr xbx xee xer xes xet xex xie xii xio xis xit xix xkb xke xks xoi xok xoo xor xos xot xox xrt xrx xsb xsi xss xst xti xtr xts xtx xxi xxo xxx

-ose bbbb bbbs bbeb bbet bbox bebb bebe bebi bebo beeb beek beer bees beet beik beir beis beit beke beki beko beks beo- beok beor beos beot bere beri berk bero berr bers bert bes- bese besk beso bess best bete beti beto bets bett bibb bibe bibi bibo bibs bieb bier bies biet biis bike biko bio- bioi bios biot biox birb bire biri birk biro birr birs birt birx bis- bise bisk biso biss bist bite bito bits bitt bitx bixi bobb bobe bobi bobo bobs boee boeo boer boes boet boi- boie boii bois boit boke boki boko boks boob booe book boor boos boot boox bor- bore bori bork boro borr bors bort bose bosi bosk boso boss bost botb bote boti boto bots bott breb bree brei brek breo brer bres bret brex brie brik brio bris brit brix brkb brob broe brok broo bror bros brot brox brrr brrs brsb brsr brst bseb bsee bser bses bset bsix bskt bsos bsse bsts btek btex btie btob btor btrt btss bttb ebbo ebbr ebbs eber ebes ebis ebit ebix eboe eboo ebor ebos ebox ebro eeee eees eeke eeks eero eers eese eesi eesk eete eets eext eiei eier eies eike eiki eiko eiks eire eirs eise eisk eiso eiss eist eitb eiti eito eitr ekeb ekek eker ekes eket ekis ekki ekoi ekos eksi eoes eoir eois eore eori eost eoto eots er-x erbb erbe ereb erei erer eres eret erie erik erio eris erit erke erki erks erob eroe eroi eroo eros erre erro errs erse ersi erso erst erts esbo esbs esee esek eseo eser eses eset esie esik esis esit eske esko esks eso- esok esos esox esri esse essi esso esst este esto estr ests etbr etee eter etes etik etio etix etoe etok etos etox etre etro etsi ette etti etto exer exes exis exit exki exo- exor exos exrx exte extr exts i-be ibes ibet ibex ibie ibis ibos ibot ibox ibri ibro ibss ibtb ibts ieet ieie ieio iere ieri iers iesi ieso iesr iest iett iies iiie iiii iiio iiis iiit iioi iioo iios iirs iisi iisr iist iitr iitt ikee iker ikes ikki