-er bbb bbe bbi bbk bbo bbr bbs bbt be- beb bee bei bek beo ber bes bet bi- bib bie bii bik bio bir bis bit bkb bke bkk bko bkr bks bkt bob boe boi bok boo bor bos bot brb bre bri brk bro brr brs brt bsb bse bsi bsk bso bsr bss bst btb bte bti btk bto btr bts btt ebb ebe ebi ebk ebo ebr ebs ebt eeb eee eek eeo eer ees eet eib eie eii eik eio eir eis eit 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 etb ete eti etk eto etr ets ett ibb ibe ibi ibk ibo ibr ibs ibt ie- iee iei iek ier ies iet iib iie iii iio iir iis iit ikb ike iki ikk iko ikr iks ikt io- iob ioe ioi ioo ior ios iot ir- irb ire iri irk iro irr irs irt is- isb ise isi isk iso isr iss ist itb ite iti itk ito its itt k-t kbb kbe kbi kbk kbo kbr kbs ke- keb kee kei kek keo ker kes ket kib kie kii kik kio kir kis kit 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 o-i ob- obb obe obi obk obo obr obs obt oeb oee oei oeo oer oes oet oib oie oii oik oio oir ois oit okb oke oki okk oko okr oks oo- oob ooi ook ooo oor oos oot or- orb ore ori ork oro orr ors ort os- osb ose osi osk oso osr oss ost ot- otb ote oti otk oto otr ots ott rbb rbe rbi rbk rbo rbr rbs rbt re- reb ree rei rek reo rer res ret rib rie rii rik rio rir ris rit rkb rke rkk rko rks rkt rob roe roi rok roo ror ros rot rrb rri rrk rrr rrs rrt rsb rse rsi rsk rso rsr rss rst rtb rte rti rtk rto rtr rts rtt sbb sbe sbi sbk sbo sbr sbs sbt se- seb see sei sek seo ser ses set sib sie sii sik sio sir sis sit sk- skb ske ski skk sko skr sks skt sob soe soi sok soo sor sos sot sr- srb sre sri srk sro srr srs srt ss- ssb sse ssi ssk sso ssr sss sst stb ste sti stk sto str sts stt tbb tbe tbi tbk tbo tbr tbs tbt te- teb tee tei tek teo ter tes tet tib tie tii tik tio tir tis tit tkb tke tkk tko tkr tks tkt to- tob toe toi tok too tor tos tot trb tre tri trk tro trr trs trt tsb tse tsi tsk tso tsr tss tst ttb tte tti ttk tto ttr tts ttt

-ose bbbb bbbs bbeb bbet 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 birb bire biri birk biro birr birs birt bis- bise bisk biso biss bist bite bito bits bitt 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 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 brie brik brio bris brit brkb brob broe brok broo bror bros brot brrr brrs brsb brsr brst bseb bsee bser bses bset bskt bsos bsse bsts btek btie btob btor btrt btss bttb ebbo ebbr ebbs eber ebes ebis ebit eboe eboo ebor ebos ebro eeee eees eeke eeks eero eers eese eesi eesk eete eets 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 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 esri esse essi esso esst este esto estr ests etbr etee eter etes etik etio etoe etok etos etre etro etsi ette etti etto i-be ibes ibet ibie ibis ibos ibot 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 ikko ikoo ikri iobi ioee ioii ioio ioit ioke ioko iooi iooo ioos iore iori iors ioso iote ioto irbe iree irer ires iri- irie irio iris irki irks irob irre irri irrs irse irte irti irts isbe isbt iseb isee iseo iser ises iset isie isis isit isko iso- isok isor isos isri isse issi isso issr isss iste isti isto istr ists itbe itbs itek iter ites itet itie itis itko itoi itoo itor itos itri itrs itse itsi itso itto k-os kbbb kbbe kbbi kbbk kbbo kbbr kbbs kbbt kbeb kbee kbek kbeo kber kbes kbet kbib kbie kbik kbio kbis kbit kbkb kbkk kbko kbkr kbob kboe kboi kbok kboo kbos kbot kbrb kbre kbri kbrk kbro kbrt kbsb kbsi kbsk kbso kbsr kbss kbst kbtb kbte kbtk kbto kbtr kbts kbtt kebb kebe kebi kebr kebt keek keer kees keet keib keii keik