-er a-a a-b a-c a-t aaa aab aac aae aak aan aar aat aau ab- aba abb abc abe abk abn abr abt abu ac- aca acb acc ace ack acn acr act acu aea aeb aec aee aek aen aer aet aeu aka akb akc ake akk akn akr aku an- ana anb anc ane ank ann anr ant anu ar- ara arb arc are ark arn arr art aru at- ata atb atc ate atn atr att atu au- aua aub auc aue auk aun aur aut b-u baa bab bac bae bak ban bar bat bau bba bbb bbc bbe bbk bbn bbr bbt bbu bca bcb bcc bce bck bcn bcr bct bcu be- bea beb bec bee bek ben ber bet beu bka bkb bkc bke bkk bkn bkr bkt bna bnb bnc bne bnk bnn bnr bnt bnu bra brb bre brk brn brr brt bru bta btb btc bte btk btn btr btt btu bua bub buc bue buk bun bur but buu c-- caa cab cac cae cak can car cat cau cba cbb cbc cbe cbk cbn cbr cbt cbu cca ccb ccc cce cck ccn ccr cct ccu ce- cea ceb cec cee cek cen cer cet ceu cka ckb ckc ckt cn- cna cnb cnc cne cnn cnr cnt cnu cra crb crc cre crk crn crr crt cru cta ctb ctc cte ctk ctn ctr ctt ctu cua cub cuc cue cuk cun cur cut cuu eaa eab eac eae eak ean ear eat eau eba ebb ebc ebe ebk ebn ebr ebt ebu ec- eca ecb ecc ece eck ecn ecr ect ecu eea eeb eec eee eek een eer eet eka ekb ekc eke ekr ekt eku en- ena enb enc ene enk enn enr ent enu era erb erc ere erk ern err ert eru eta etb etc ete etk etn etr ett etu eu- eua eub euc eue eun eur eut k-t ka- kaa kab kac kae kak kan kar kat kau kba kbb kbc kbe kbk kbn kbr kbu kca kcb kcc kce kck kcn kcr kct kcu ke- kea keb kec kee kek ken ker ket kkb kkc kke kkk kkn kkr kkt kku kn- kna knc kne knk knn knr knt knu kra krc krk krn krr krt kru kta ktb ktc kte ktk ktn ktr ktt ktu kub kuc kue kuk kun kur kut kuu naa nab nac nae nak nan nar nat nau nba nbb nbc nbe nbk nbn nbr nbt nbu nca ncb ncc nce nck ncn ncr nct ncu ne- nea neb nec nee nek nen ner net neu nka nkc nke nkk nkn nkr nkt nku nna nnb nnc nne nnk nnn nnt nnu nra nrb nrc nre nrk nrn nrr nrt nru nta ntb ntc nte ntk ntn ntr ntt ntu nua nub nuc nue nuk nun nur nut nuu ra- raa rab rac rae rak ran rar rat rau rba rbb rbc rbe rbk rbn rbr rbt rbu rca rcb rcc rce rcn rcr rct rcu re- rea reb rec ree rek ren rer ret reu rkb rkc rke rkk rkt rku rna rnb rnc rnn rnr rnt rnu rra rrb rrc rrk rrn rrr rrt rru rta rtb rtc rte rtk rtn rtr rtt rtu rua rub ruc rue ruk run rur rut ruu taa tab tac tae tak tan tar tat tau tba tbb tbc tbe tbk tbn tbr tbt tbu tca tcb tcc tce tck tcn tcr tct tcu te- tea teb tec tee tek ten ter tet teu tka tkb tkc tke tkk tkr tkt tna tnb tnc tne tnk tnn tnr tnt tra trb trc tre trk trn trr trt tru tta ttb ttc tte ttk ttn ttr ttt ttu tua tub tuc tue tuk tun tur tut tuu ua- uaa uab uac uae uak uan uar uat uau uba ubb ubc ube ubk ubn ubr ubt ubu uca ucb ucc uce uck ucn ucr uct ucu uea ueb uec uee uen uer uet uka ukb ukc uke ukk ukn ukr uku un- una unb unc une unk unn unr unt unu ur- ura urb urc ure urk urn urr urt uru uta utb utc ute utk utn utr utt utu uua uuc uue uun uur uut uuu