-er -ic bbb bbc bbe bbf bbi bbk bbr bbs bbt bcb bcc bce bcf bci bck bcr bcs bct be- beb bec bee bef bei bek ber bes bet bfb bfc bfe bff bfi bfr bfs bft bi- bib bic bie bif bii bik bir bis bit bkb bkc bke bkf bkk bkr bks bkt brb bre brf bri brk brr brs brt bsb bsc bse bsf bsi bsk bsr bss bst btb btc bte btf bti btk btr bts btt c-- cbb cbc cbe cbf cbi cbk cbr cbs cbt ccb ccc cce ccf cci cck ccr ccs cct ce- ceb cec cee cef cei cek cer ces cet cfb cfc cfe cff cfi cfk cfr cfs cft ci- cib cic cie cif cii cik cir cis cit ckb ckc cki cks ckt crb crc cre crf cri crk crr crs crt csb csc cse csf csi csk csr css cst ctb ctc cte ctf cti ctk ctr cts ctt ebb ebc ebe ebf ebi ebk ebr ebs ebt ec- ecb ecc ece ecf eci eck ecr ecs ect eeb eec eee eef eek eer ees eet ef- efb efc efe eff efi efr efs eft eib eic eie eif eii eik eir eis eit ekb ekc eke ekf eki ekr eks ekt erb erc ere erf eri erk err ers ert es- esb esc ese esf esi esk esr ess est etb etc ete etf eti etk etr ets ett fbb fbc fbe fbf fbi fbk fbr fbs fbt fcb fcc fce fcf fci fck fcr fcs fct feb fec fee fef fei fek fer fes fet ffc ffe fff ffi ffk ffr ffs fft fib fic fie fif fii fik fir fis fit fkb fkc fkf fki fkk fkt frb frc fre frf fri frk frr frs frt fsb fsc fse fsf fsi fsk fsr fss fst ftb ftc fte ftf fti ftk ftr fts ftt i-f ibb ibc ibe ibf ibi ibk ibr ibs ibt icb icc ice icf ici ick icr ics ict ie- iec iee ief iei iek ier ies iet ifb ifc ife iff ifi ifr ifs ift iib iic iie iif iii iir iis iit ikb ikc ike ikf iki ikk ikr iks ikt ir- irb irc ire irf iri irk irr irs irt is- isb isc ise isf isi isk isr iss ist itb itc ite itf iti itk its itt k-t kbb kbc kbe kbf kbi kbk kbr kbs kcb kcc kce kci kck kcr kcs kct ke- keb kec kee kef kei kek ker kes ket kfc kff kfi kfs kib kic kie kif kii kik kir kis kit kkb kkc kke kki kkk kkr kks kkt krc krf kri krk krr krs krt ksb ksc kse ksf ksi ksk ksr kss kst ktb ktc kte ktf ktk ktr kts ktt rbb rbc rbe rbf rbi rbk rbr rbs rbt rcb rcc rce rcf rci rcr rcs rct re- reb rec ree ref rei rek rer res ret rfb rfc rfe rff rfi rfk rfr rfs rft rib ric rie rif rii rik rir ris rit rkb rkc rke rkf rkk rks rkt rrb rrc rrf rri rrk rrr rrs rrt rsb rsc rse rsf rsi rsk rsr rss rst rtb rtc rte rtf rti rtk rtr rts rtt sbb sbc sbe sbf sbi sbk sbr sbs sbt scb scc sce scf sci sck scr scs sct se- seb sec see sef sei sek ser ses set sfb sfc sfe sff sfi sfk sfr sfs sft sib sic sie sif sii sik sir sis sit sk- skb skc ske skf ski skk skr sks skt sr- srb src sre srf sri srk srr srs srt ss- ssb ssc sse ssf ssi ssk ssr sss sst stb stc ste stf sti stk str sts stt tbb tbc tbe tbf tbi tbk tbr tbs tbt tcb tcc tce tcf tci tck tcr tcs tct te- teb tec tee tef tei tek ter tes tet tfb tfc tfe tff tfi tfk tfr tfs tft tib tic tie tif tii tik tir tis tit tkb tkc tke tkk tkr tks tkt trb trc tre trf tri trk trr trs trt tsb tsc tse tsf tsi tsk tsr tss tst ttb ttc tte ttf tti ttk ttr tts ttt