-er -ic bbb bbc bbe bbf bbi bbk bbr bbt bcb bcc bce bcf bci bck bcr bct be- beb bec bee bef bei bek ber bet bfb bfc bfe bff bfi bfr bft bi- bib bic bie bif bii bik bir bit bkb bkc bke bkf bkk bkr bkt brb bre brf bri brk brr brt btb btc bte btf bti btk btr btt c-- cbb cbc cbe cbf cbi cbk cbr cbt ccb ccc cce ccf cci cck ccr cct ce- ceb cec cee cef cei cek cer cet cfb cfc cfe cff cfi cfk cfr cft ci- cib cic cie cif cii cik cir cit ckb ckc cki ckt crb crc cre crf cri crk crr crt ctb ctc cte ctf cti ctk ctr ctt ebb ebc ebe ebf ebi ebk ebr ebt ec- ecb ecc ece ecf eci eck ecr ect eeb eec eee eef eek eer eet ef- efb efc efe eff efi efr eft eib eic eie eif eii eik eir eit ekb ekc eke ekf eki ekr ekt erb erc ere erf eri erk err ert etb etc ete etf eti etk etr ett fbb fbc fbe fbf fbi fbk fbr fbt fcb fcc fce fcf fci fck fcr fct feb fec fee fef fei fek fer fet ffc ffe fff ffi ffk ffr fft fib fic fie fif fii fik fir fit fkb fkc fkf fki fkk fkt frb frc fre frf fri frk frr frt ftb ftc fte ftf fti ftk ftr ftt i-f ibb ibc ibe ibf ibi ibk ibr ibt icb icc ice icf ici ick icr ict ie- iec iee ief iei iek ier iet ifb ifc ife iff ifi ifr ift iib iic iie iif iii iir iit ikb ikc ike ikf iki ikk ikr ikt ir- irb irc ire irf iri irk irr irt itb itc ite itf iti itk itt k-t kbb kbc kbe kbf kbi kbk kbr kcb kcc kce kci kck kcr kct ke- keb kec kee kef kei kek ker ket kfc kff kfi kib kic kie kif kii kik kir kit kkb kkc kke kki kkk kkr kkt krc krf kri krk krr krt ktb ktc kte ktf ktk ktr ktt rbb rbc rbe rbf rbi rbk rbr rbt rcb rcc rce rcf rci rcr rct re- reb rec ree ref rei rek rer ret rfb rfc rfe rff rfi rfk rfr rft rib ric rie rif rii rik rir rit rkb rkc rke rkf rkk rkt rrb rrc rrf rri rrk rrr rrt rtb rtc rte rtf rti rtk rtr rtt tbb tbc tbe tbf tbi tbk tbr tbt tcb tcc tce tcf tci tck tcr tct te- teb tec tee tef tei tek ter tet tfb tfc tfe tff tfi tfk tfr tft tib tic tie tif tii tik tir tit tkb tkc tke tkk tkr tkt trb trc tre trf tri trk trr trt ttb ttc tte ttf tti ttk ttr ttt