-er a-a a-b a-c a-t aaa aab aac aae aan aar aas aat aau ab- aba abb abc abe abn abr abs abt abu ac- aca acb acc ace acn acr acs act acu aea aeb aec aee aen aer aes aet aeu an- ana anb anc ane ann anr ans ant anu ar- ara arb arc are arn arr ars art aru as- asa asb asc ase asn asr ass ast asu at- ata atb atc ate atn atr ats att atu au- aua aub auc aue aun aur aus aut b-u baa bab bac bae ban bar bas bat bau bba bbb bbc bbe bbn bbr bbs bbt bbu bca bcb bcc bce bcn bcr bcs bct bcu be- bea beb bec bee ben ber bes bet beu bna bnb bnc bne bnn bnr bns bnt bnu bra brb bre brn brr brs brt bru bsa bsb bsc bse bsn bsr bss bst bsu bta btb btc bte btn btr bts btt btu bua bub buc bue bun bur bus but buu c-- caa cab cac cae can car cas cat cau cba cbb cbc cbe cbn cbr cbs cbt cbu cca ccb ccc cce ccn ccr ccs cct ccu ce- cea ceb cec cee cen cer ces cet ceu cn- cna cnb cnc cne cnn cnr cns cnt cnu cra crb crc cre crn crr crs crt cru csa csb csc cse csn csr css cst csu cta ctb ctc cte ctn ctr cts ctt ctu cua cub cuc cue cun cur cus cut cuu eaa eab eac eae ean ear eas eat eau eba ebb ebc ebe ebn ebr ebs ebt ebu ec- eca ecb ecc ece ecn ecr ecs ect ecu eea eeb eec eee een eer ees eet en- ena enb enc ene enn enr ens ent enu era erb erc ere ern err ers ert eru es- esa esb esc ese esn esr ess est esu eta etb etc ete etn etr ets ett etu eu- eua eub euc eue eun eur eus eut naa nab nac nae nan nar nas nat nau nba nbb nbc nbe nbn nbr nbs nbt nbu nca ncb ncc nce ncn ncr ncs nct ncu ne- nea neb nec nee nen ner nes net neu nna nnb nnc nne nnn nns nnt nnu nra nrb nrc nre nrn nrr nrs nrt nru nsa nsb nsc nse nsn nsr nss nst nsu nta ntb ntc nte ntn ntr nts ntt ntu nua nub nuc nue nun nur nus nut nuu ra- raa rab rac rae ran rar ras rat rau rba rbb rbc rbe rbn rbr rbs rbt rbu rca rcb rcc rce rcn rcr rcs rct rcu re- rea reb rec ree ren rer res ret reu rna rnb rnc rnn rnr rns rnt rnu rra rrb rrc rrn rrr rrs rrt rru rsa rsb rsc rse rsn rsr rss rst rsu rta rtb rtc rte rtn rtr rts rtt rtu rua rub ruc rue run rur rus rut ruu saa sab sac sae san sar sas sat sau sba sbb sbc sbe sbn sbr sbs sbt sbu sca scb scc sce scn scr scs sct scu se- sea seb sec see sen ser ses set seu sna snb snc sne snn snr sns snt snu sr- sra srb src sre srn srr srs srt ss- ssa ssb ssc sse ssn ssr sss sst ssu sta stb stc ste stn str sts stt stu sua sub suc sue sun sur sus sut suu taa tab tac tae tan tar tas tat tau tba tbb tbc tbe tbn tbr tbs tbt tbu tca tcb tcc tce tcn tcr tcs tct tcu te- tea teb tec tee ten ter tes tet teu tna tnb tnc tne tnn tnr tns tnt tra trb trc tre trn trr trs trt tru tsa tsb tsc tse tsn tsr tss tst tsu tta ttb ttc tte ttn ttr tts ttt ttu tua tub tuc tue tun tur tus tut tuu ua- uaa uab uac uae uan uar uas uat uau uba ubb ubc ube ubn ubr ubs ubt ubu uca ucb ucc uce ucn ucr ucs uct ucu uea ueb uec uee uen uer ues uet un- una unb unc une unn unr uns unt unu ur- ura urb urc ure urn urr urs urt uru usa usb usc use usn usr uss ust usu uta utb utc ute utn utr uts utt utu uua uuc uue uun uur uus uut uuu