-er b-u bbb bbc bbe bbf bbk bbl bbr bbs bbt bbu bcb bcc bce bcf bck bcl bcr bcs bct bcu be- beb bec bee bef bek bel ber bes bet beu bfb bfc bfe bff bfl bfr bfs bft bfu bkb bkc bke bkf bkk bkl bkr bks bkt blb blc ble blf blk bll blr bls blt blu brb bre brf brk brl brr brs brt bru bsb bsc bse bsf bsk bsl bsr bss bst bsu btb btc bte btf btk btl btr bts btt btu bub buc bue buf buk bul bur bus but buu c-- cbb cbc cbe cbf cbk cbl cbr cbs cbt cbu ccb ccc cce ccf cck ccl ccr ccs cct ccu ce- ceb cec cee cef cek cel cer ces cet ceu cfb cfc cfe cff cfk cfl cfr cfs cft cfu ckb ckc cks ckt cl- clb clc cle clf clk cll clr cls clt clu crb crc cre crf crk crl crr crs crt cru csb csc cse csf csk csl csr css cst csu ctb ctc cte ctf ctk ctl ctr cts ctt ctu cub cuc cue cuf cuk cul cur cus cut cuu ebb ebc ebe ebf ebk ebl ebr ebs ebt ebu ec- ecb ecc ece ecf eck ecl ecr ecs ect ecu eeb eec eee eef eek eel eer ees eet ef- efb efc efe eff efl efr efs eft ekb ekc eke ekf ekl ekr eks ekt eku elb elc ele elf elk ell elr els elt elu erb erc ere erf erk erl err ers ert eru es- esb esc ese esf esk esl esr ess est esu etb etc ete etf etk etl etr ets ett etu eu- eub euc eue euf eul eur eus eut fbb fbc fbe fbf fbk fbl fbr fbs fbt fbu fcb fcc fce fcf fck fcl fcr fcs fct fcu feb fec fee fef fek fel fer fes fet feu ffc ffe fff ffk ffl ffr ffs fft ffu fkb fkc fkf fkk fkl fkt flb flc fle flf fll flr fls flt flu frb frc fre frf frk frl frr frs frt fru fsb fsc fse fsf fsk fsl fsr fss fst fsu ftb ftc fte ftf ftk ftl ftr fts ftt ftu fub fue fuf fuk ful fur fus fut fuu k-t kbb kbc kbe kbf kbk kbl kbr kbs kbu kcb kcc kce kck kcl kcr kcs kct kcu ke- keb kec kee kef kek kel ker kes ket kfc kff kfs kfu kkb kkc kke kkk kkl kkr kks kkt kku kl- klb klc klf klr kls klt klu krc krf krk krl krr krs krt kru ksb ksc kse ksf ksk ksl ksr kss kst ksu ktb ktc kte ktf ktk ktl ktr kts ktt ktu kub kuc kue kuk kul kur kus kut kuu lbb lbc lbe lbf lbk lbl lbr lbs lbt lbu lcb lcc lce lcf lck lcl lcr lcs lct lcu leb lec lee lef lek lel ler les let leu lfb lfc lfe lff lfk lfl lfr lfs lft lfu lkb lkl lkr lks lkt llb llc lle llf llk lll llr lls llt llu lrb lrc lrf lrk lrr lrs lrt lru lsb lsc lse lsf lsk lsl lsr lss lst lsu ltb ltc lte ltf ltk ltl ltr lts ltt ltu lub luc lue luf luk lul lur lus lut luu rbb rbc rbe rbf rbk rbl rbr rbs rbt rbu rcb rcc rce rcf rcl rcr rcs rct rcu re- reb rec ree ref rek rel rer res ret reu rfb rfc rfe rff rfk rfl rfr rfs rft rfu rkb rkc rke rkf rkk rks rkt rku rlc rle rlf rll rlr rls rlt rlu rrb rrc rrf rrk rrl rrr rrs rrt rru rsb rsc rse rsf rsk rsl rsr rss rst rsu rtb rtc rte rtf rtk rtl rtr rts rtt rtu rub ruc rue ruf ruk rur rus rut ruu sbb sbc sbe sbf sbk sbl sbr sbs sbt sbu scb scc sce scf sck scl scr scs sct scu se- seb sec see sef sek sel ser ses set seu sfb sfc sfe sff sfk sfl sfr sfs sft sfu sk- skb skc ske skf skk skl skr sks skt sku slb slc sle slf slk sll slr sls slt slu sr- srb src sre srf srk srl srr srs srt ss- ssb ssc sse ssf ssk ssl ssr sss sst ssu stb stc ste stf stk stl str sts stt stu sub suc sue suf suk sul sur sus sut suu tbb tbc tbe tbf tbk tbl tbr tbs tbt tbu tcb tcc tce tcf tck tcl tcr tcs tct tcu te- teb tec tee tef tek tel ter tes tet teu tfb tfc tfe tff tfk tfl tfr tfs tft tfu tkb tkc tke tkk tkl tkr tks tkt tlc tle tlf tlk tll tlr tls tlt tlu trb trc tre trf trk trl trr trs trt tru tsb tsc tse tsf tsk tsl tsr tss tst tsu ttb ttc tte ttf ttk ttl ttr tts ttt ttu tub tuc tue tuf tuk tul tur tus tut tuu ubb ubc ube ubf ubk ubl ubr ubs ubt ubu ucb ucc uce ucf uck ucl ucr ucs uct ucu ueb uec uee uef uel uer ues uet ufc ufe uff ufl ufr ufs uft ufu ukb ukc uke ukf ukk ukl ukr uku ulb ulc ule ulf ulk ull ulr uls ult ulu ur- urb urc ure urf urk url urr urs urt uru usb usc use usf usk usl usr uss ust usu utb utc ute utf utk utl utr uts utt utu uuc uue uur uus uut uuu