-er -ic bbb bbc bbe bbi bbk bbl bbr bbt bcb bcc bce bci bck bcl bcr bct be- beb bec bee bei bek bel ber bet bi- bib bic bie bii bik bil bir bit bkb bkc bke bkk bkl bkr bkt blb blc ble bli blk bll blr blt brb bre bri brk brl brr brt btb btc bte bti btk btl btr btt c-- cbb cbc cbe cbi cbk cbl cbr cbt ccb ccc cce cci cck ccl ccr cct ce- ceb cec cee cei cek cel cer cet ci- cib cic cie cii cik cil cir cit ckb ckc cki ckt cl- clb clc cle cli clk cll clr clt crb crc cre cri crk crl crr crt ctb ctc cte cti ctk ctl ctr ctt ebb ebc ebe ebi ebk ebl ebr ebt ec- ecb ecc ece eci eck ecl ecr ect eeb eec eee eek eel eer eet eib eic eie eii eik eil eir eit ekb ekc eke eki ekl ekr ekt elb elc ele eli elk ell elr elt erb erc ere eri erk erl err ert etb etc ete eti etk etl etr ett ibb ibc ibe ibi ibk ibl ibr ibt icb icc ice ici ick icl icr ict ie- iec iee iei iek iel ier iet iib iic iie iii iil iir iit ikb ikc ike iki ikk ikl ikr ikt il- ilb ilc ile ili ilk ill ilr ilt ir- irb irc ire iri irk irl irr irt itb itc ite iti itk itl itt k-t kbb kbc kbe kbi kbk kbl kbr kcb kcc kce kci kck kcl kcr kct ke- keb kec kee kei kek kel ker ket kib kic kie kii kik kil kir kit kkb kkc kke kki kkk kkl kkr kkt kl- klb klc kli klr klt krc kri krk krl krr krt ktb ktc kte ktk ktl ktr ktt lbb lbc lbe lbi lbk lbl lbr lbt lcb lcc lce lci lck lcl lcr lct leb lec lee lei lek lel ler let lib lic lie lii lik lil lir lit lkb lkl lkr lkt llb llc lle lli llk lll llr llt lrb lrc lri lrk lrr lrt ltb ltc lte lti ltk ltl ltr ltt rbb rbc rbe rbi rbk rbl rbr rbt rcb rcc rce rci rcl rcr rct re- reb rec ree rei rek rel rer ret rib ric rie rii rik ril rir rit rkb rkc rke rkk rkt rlc rle rli rll rlr rlt rrb rrc rri rrk rrl rrr rrt rtb rtc rte rti rtk rtl rtr rtt tbb tbc tbe tbi tbk tbl tbr tbt tcb tcc tce tci tck tcl tcr tct te- teb tec tee tei tek tel ter tet tib tic tie tii tik til tir tit tkb tkc tke tkk tkl tkr tkt tlc tle tli tlk tll tlr tlt trb trc tre tri trk trl trr trt ttb ttc tte tti ttk ttl ttr ttt