-er a-a a-b a-c a-t aaa aab aac aae aan aar aat aau ab- aba abb abc abe abn abr abt abu ac- aca acb acc ace acn acr act acu aea aeb aec aee aen aer aet aeu an- ana anb anc ane ann anr ant anu ar- ara arb arc are arn arr art aru at- ata atb atc ate atn atr att atu au- aua aub auc aue aun aur aut b-u baa bab bac bae ban bar bat bau bba bbb bbc bbe bbn bbr bbt bbu bca bcb bcc bce bcn bcr bct bcu be- bea beb bec bee ben ber bet beu bna bnb bnc bne bnn bnr bnt bnu bra brb bre brn brr brt bru bta btb btc bte btn btr btt btu bua bub buc bue bun bur but buu c-- caa cab cac cae can car cat cau cba cbb cbc cbe cbn cbr cbt cbu cca ccb ccc cce ccn ccr cct ccu ce- cea ceb cec cee cen cer cet ceu cn- cna cnb cnc cne cnn cnr cnt cnu cra crb crc cre crn crr crt cru cta ctb ctc cte ctn ctr ctt ctu cua cub cuc cue cun cur cut cuu eaa eab eac eae ean ear eat eau eba ebb ebc ebe ebn ebr ebt ebu ec- eca ecb ecc ece ecn ecr ect ecu eea eeb eec eee een eer eet en- ena enb enc ene enn enr ent enu era erb erc ere ern err ert eru eta etb etc ete etn etr ett etu eu- eua eub euc eue eun eur eut naa nab nac nae nan nar nat nau nba nbb nbc nbe nbn nbr nbt nbu nca ncb ncc nce ncn ncr nct ncu ne- nea neb nec nee nen ner net neu nna nnb nnc nne nnn nnt nnu nra nrb nrc nre nrn nrr nrt nru nta ntb ntc nte ntn ntr ntt ntu nua nub nuc nue nun nur nut nuu ra- raa rab rac rae ran rar rat rau rba rbb rbc rbe rbn rbr rbt rbu rca rcb rcc rce rcn rcr rct rcu re- rea reb rec ree ren rer ret reu rna rnb rnc rnn rnr rnt rnu rra rrb rrc rrn rrr rrt rru rta rtb rtc rte rtn rtr rtt rtu rua rub ruc rue run rur rut ruu taa tab tac tae tan tar tat tau tba tbb tbc tbe tbn tbr tbt tbu tca tcb tcc tce tcn tcr tct tcu te- tea teb tec tee ten ter tet teu tna tnb tnc tne tnn tnr tnt tra trb trc tre trn trr trt tru tta ttb ttc tte ttn ttr ttt ttu tua tub tuc tue tun tur tut tuu ua- uaa uab uac uae uan uar uat uau uba ubb ubc ube ubn ubr ubt ubu uca ucb ucc uce ucn ucr uct ucu uea ueb uec uee uen uer uet un- una unb unc une unn unr unt unu ur- ura urb urc ure urn urr urt uru uta utb utc ute utn utr utt utu uua uuc uue uun uur uut uuu