-er -ic b-u bbb bbc bbe bbf bbi bbk bbo bbr bbs bbt bbu bcb bcc bce bcf bci bck bco bcr bcs bct bcu be- beb bec bee bef bei bek beo ber bes bet beu bfb bfc bfe bff bfi bfo bfr bfs bft bfu bi- bib bic bie bif bii bik bio bir bis bit biu bkb bkc bke bkf bkk bko bkr bks bkt bob boc boe bof boi bok boo bor bos bot bou brb bre brf bri brk bro brr brs brt bru bsb bsc bse bsf bsi bsk bso bsr bss bst bsu btb btc bte btf bti btk bto btr bts btt btu bub buc bue buf bui buk buo bur bus but buu c-- cbb cbc cbe cbf cbi cbk cbo cbr cbs cbt cbu ccb ccc cce ccf cci cck cco ccr ccs cct ccu ce- ceb cec cee cef cei cek ceo cer ces cet ceu cfb cfc cfe cff cfi cfk cfo cfr cfs cft cfu ci- cib cic cie cif cii cik cio cir cis cit ciu ckb ckc cki cko cks ckt co- cob coc coe cof coi cok coo cor cos cot cou crb crc cre crf cri crk cro crr crs crt cru csb csc cse csf csi csk cso csr css cst csu ctb ctc cte ctf cti ctk cto ctr cts ctt ctu cub cuc cue cuf cui cuk cuo cur cus cut cuu ebb ebc ebe ebf ebi ebk ebo ebr ebs ebt ebu ec- ecb ecc ece ecf eci eck eco ecr ecs ect ecu eeb eec eee eef eek eeo eer ees eet ef- efb efc efe eff efi efo efr efs eft eib eic eie eif eii eik eio eir eis eit eiu ekb ekc eke ekf eki eko ekr eks ekt eku eo- eob eoc eoe eof eoi eok eoo eor eos eot eou erb erc ere erf eri erk ero err ers ert eru es- esb esc ese esf esi esk eso esr ess est esu etb etc ete etf eti etk eto etr ets ett etu eu- eub euc eue euf eui eur eus eut fbb fbc fbe fbf fbi fbk fbo fbr fbs fbt fbu fcb fcc fce fcf fci fck fco fcr fcs fct fcu feb fec fee fef fei fek feo fer fes fet feu ffc ffe fff ffi ffk ffo ffr ffs fft ffu fib fic fie fif fii fik fir fis fit fiu fkb fkc fkf fki fkk fkt fob foc foe fof foi fok foo for fos fot fou frb frc fre frf fri frk fro frr frs frt fru fsb fsc fse fsf fsi fsk fso fsr fss fst fsu ftb ftc fte ftf fti ftk fto ftr fts ftt ftu fub fue fuf fui fuk fuo fur fus fut fuu i-f ibb ibc ibe ibf ibi ibk ibo ibr ibs ibt ibu icb icc ice icf ici ick ico icr ics ict icu ie- iec iee ief iei iek ier ies iet ifb ifc ife iff ifi ifo ifr ifs ift ifu iib iic iie iif iii iio iir iis iit iiu ikb ikc ike ikf iki ikk iko ikr iks ikt iku io- iob ioc ioe iof ioi ioo ior ios iot iou ir- irb irc ire irf iri irk iro irr irs irt iru is- isb isc ise isf isi isk iso isr iss ist isu itb itc ite itf iti itk ito its itt itu iu- iub iuc iue iui iur ius iut k-t kbb kbc kbe kbf kbi kbk kbo kbr kbs kbu kcb kcc kce kci kck kcr kcs kct kcu ke- keb kec kee kef kei kek keo ker kes ket kfc kff kfi kfo kfs kfu kib kic kie kif kii kik kio kir kis kit kiu kkb kkc kke kki kkk kkr kks kkt kku kob koc koe kof koi kok koo kor kos kot kou krc krf kri krk kro krr krs krt kru ksb ksc kse ksf ksi ksk kso ksr kss kst ksu ktb ktc kte ktf ktk kto ktr kts ktt ktu kub kuc kue kui kuk kur kus kut kuu o-i ob- obb obc obe obf obi obk obo obr obs obt obu oc- ocb occ ocf oci ock oco ocr ocs oct ocu oeb oec oee oef oei oeo oer oes oet of- ofb ofc ofe off ofi ofo ofr ofs oft ofu oib oic oie oif oii oik oio oir ois oit oiu okb okc oke oki okk oko okr oks oku oo- oob ooc oof ooi ook ooo oor oos oot or- orb orc ore orf ori ork oro orr ors ort oru os- osb osc ose osf osi osk oso osr oss ost osu ot- otb otc ote otf oti otk oto otr ots ott otu ou- ouc oue ouf oui ouk ouo our ous out rbb rbc rbe rbf rbi rbk rbo rbr rbs rbt rbu rcb rcc rce rcf rci rco rcr rcs rct rcu re- reb rec ree ref rei rek reo rer res ret reu rfb rfc rfe rff rfi rfk rfo rfr rfs rft rfu rib ric rie rif rii rik rio rir ris rit rkb rkc rke rkf rkk rko rks rkt rku rob roc roe rof roi rok roo ror ros rot rou rrb rrc rrf rri rrk rrr rrs rrt rru rsb rsc rse rsf rsi rsk rso rsr rss rst rsu rtb rtc rte rtf rti rtk rto rtr rts rtt rtu rub ruc rue ruf rui ruk ruo rur rus rut ruu sbb sbc sbe sbf sbi sbk sbo sbr sbs sbt sbu scb scc sce scf sci sck sco scr scs sct scu se- seb sec see sef sei sek seo ser ses set seu sfb sfc sfe sff sfi sfk sfo sfr sfs sft sfu sib sic sie sif sii sik sio sir sis sit siu sk- skb skc ske skf ski skk sko skr sks skt sku