-er -ic b-u bbb bbc bbe bbi bbk bbr bbs bbt bbu bcb bcc bce bci bck bcr bcs bct bcu be- beb bec bee bei bek ber bes bet beu bi- bib bic bie bii bik bir bis bit biu bkb bkc bke bkk bkr bks bkt brb bre bri brk brr brs brt bru bsb bsc bse bsi bsk bsr bss bst bsu btb btc bte bti btk btr bts btt btu bub buc bue bui buk bur bus but buu c-- cbb cbc cbe cbi cbk cbr cbs cbt cbu ccb ccc cce cci cck ccr ccs cct ccu ce- ceb cec cee cei cek cer ces cet ceu ci- cib cic cie cii cik cir cis cit ciu ckb ckc cki cks ckt crb crc cre cri crk crr crs crt cru csb csc cse csi csk csr css cst csu ctb ctc cte cti ctk ctr cts ctt ctu cub cuc cue cui cuk cur cus cut cuu ebb ebc ebe ebi ebk ebr ebs ebt ebu ec- ecb ecc ece eci eck ecr ecs ect ecu eeb eec eee eek eer ees eet eib eic eie eii eik eir eis eit eiu ekb ekc eke eki ekr eks ekt eku erb erc ere eri erk err ers ert eru es- esb esc ese esi esk esr ess est esu etb etc ete eti etk etr ets ett etu eu- eub euc eue eui eur eus eut ibb ibc ibe ibi ibk ibr ibs ibt ibu icb icc ice ici ick icr ics ict icu ie- iec iee iei iek ier ies iet iib iic iie iii iir iis iit iiu ikb ikc ike iki ikk ikr iks ikt iku ir- irb irc ire iri irk irr irs irt iru is- isb isc ise isi isk isr iss ist isu itb itc ite iti itk its itt itu iu- iub iuc iue iui iur ius iut k-t kbb kbc kbe kbi kbk kbr kbs kbu kcb kcc kce kci kck kcr kcs kct kcu ke- keb kec kee kei kek ker kes ket kib kic kie kii kik kir kis kit kiu kkb kkc kke kki kkk kkr kks kkt kku krc kri krk krr krs krt kru ksb ksc kse ksi ksk ksr kss kst ksu ktb ktc kte ktk ktr kts ktt ktu kub kuc kue kui kuk kur kus kut kuu rbb rbc rbe rbi rbk rbr rbs rbt rbu rcb rcc rce rci rcr rcs rct rcu re- reb rec ree rei rek rer res ret reu rib ric rie rii rik rir ris rit rkb rkc rke rkk rks rkt rku rrb rrc rri rrk rrr rrs rrt rru rsb rsc rse rsi rsk rsr rss rst rsu rtb rtc rte rti rtk rtr rts rtt rtu rub ruc rue rui ruk rur rus rut ruu sbb sbc sbe sbi sbk sbr sbs sbt sbu scb scc sce sci sck scr scs sct scu se- seb sec see sei sek ser ses set seu sib sic sie sii sik sir sis sit siu sk- skb skc ske ski skk skr sks skt sku sr- srb src sre sri srk srr srs srt ss- ssb ssc sse ssi ssk ssr sss sst ssu stb stc ste sti stk str sts stt stu sub suc sue sui suk sur sus sut suu tbb tbc tbe tbi tbk tbr tbs tbt tbu tcb tcc tce tci tck tcr tcs tct tcu te- teb tec tee tei tek ter tes tet teu tib tic tie tii tik tir tis tit tiu tkb tkc tke tkk tkr tks tkt trb trc tre tri trk trr trs trt tru tsb tsc tse tsi tsk tsr tss tst tsu ttb ttc tte tti ttk ttr tts ttt ttu tub tuc tue tui tuk tur tus tut tuu ubb ubc ube ubi ubk ubr ubs ubt ubu ucb ucc uce uci uck ucr ucs uct ucu ueb uec uee uei uer ues uet uib uic uie uii uir uis uit uiu ukb ukc uke uki ukk ukr uku ur- urb urc ure uri urk urr urs urt uru usb usc use usi usk usr uss ust usu utb utc ute uti utk utr uts utt utu uuc uue uur uus uut uuu