-er a-a a-b a-c a-t aaa aab aac aae aak aan aar aat aau aav ab- aba abb abc abe abk abn abr abt abu abv ac- aca acb acc ace ack acn acr act acu acv aea aeb aec aee aek aen aer aet aeu aev aka akb akc ake akk akn akr aku akv an- ana anb anc ane ank ann anr ant anu anv ar- ara arb arc are ark arn arr art aru arv at- ata atb atc ate atn atr att atu atv au- aua aub auc aue auk aun aur aut auv av- ava avb avc ave avk avn avr avt avu b-u baa bab bac bae bak ban bar bat bau bav bba bbb bbc bbe bbk bbn bbr bbt bbu bca bcb bcc bce bck bcn bcr bct bcu bcv be- bea beb bec bee bek ben ber bet beu bev bka bkb bkc bke bkk bkn bkr bkt bkv bna bnb bnc bne bnk bnn bnr bnt bnu bnv bra brb bre brk brn brr brt bru brv bta btb btc bte btk btn btr btt btu btv bua bub buc bue buk bun bur but buu bva bvb bvc bve bvk bvn bvr bvt bvu bvv c-- caa cab cac cae cak can car cat cau cav cba cbb cbc cbe cbk cbn cbr cbt cbu cbv cca ccb ccc cce cck ccn ccr cct ccu ccv ce- cea ceb cec cee cek cen cer cet ceu cev cka ckb ckc ckt cn- cna cnb cnc cne cnn cnr cnt cnu cnv cra crb crc cre crk crn crr crt cru crv cta ctb ctc cte ctk ctn ctr ctt ctu ctv cua cub cuc cue cuk cun cur cut cuu cuv cva cvb cvc cve cvk cvn cvr cvt cvu cvv eaa eab eac eae eak ean ear eat eau eav eba ebb ebc ebe ebk ebn ebr ebt ebu ebv ec- eca ecb ecc ece eck ecn ecr ect ecu ecv eea eeb eec eee eek een eer eet eev eka ekb ekc eke ekr ekt eku ekv en- ena enb enc ene enk enn enr ent enu env era erb erc ere erk ern err ert eru erv eta etb etc ete etk etn etr ett etu etv eu- eua eub euc eue eun eur eut euv eva evb evc eve evn evr evt evv k-t ka- kaa kab kac kae kak kan kar kat kau kav 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 kev kkb kkc kke kkk kkn kkr kkt kku kkv kn- kna knc kne knk knn knr knt knu kra krc krk krn krr krt kru krv kta ktb ktc kte ktk ktn ktr ktt ktu ktv kub kuc kue kuk kun kur kut kuu kva kvb kvk kvn kvr kvv naa nab nac nae nak nan nar nat nau nav nba nbb nbc nbe nbk nbn nbr nbt nbu nbv nca ncb ncc nce nck ncn ncr nct ncu ncv ne- nea neb nec nee nek nen ner net neu nev nka nkc nke nkk nkn nkr nkt nku nna nnb nnc nne nnk nnn nnt nnu nnv nra nrb nrc nre nrk nrn nrr nrt nru nrv nta ntb ntc nte ntk ntn ntr ntt ntu ntv nua nub nuc nue nuk nun nur nut nuu nuv nva nvb nvc nve nvk nvn nvt nvu nvv ra- raa rab rac rae rak ran rar rat rau rav rba rbb rbc rbe rbk rbn rbr rbt rbu rca rcb rcc rce rcn rcr rct rcu rcv re- rea reb rec ree rek ren rer ret reu rev rkb rkc rke rkk rkt rku rkv rna rnb rnc rnn rnr rnt rnu rnv rra rrb rrc rrk rrn rrr rrt rru rta rtb rtc rte rtk rtn rtr rtt rtu rtv rua rub ruc rue ruk run rur rut ruu ruv rva rvb rvc rve rvn rvr rvt rvu rvv taa tab tac tae tak tan tar tat tau tav tba tbb tbc tbe tbk tbn tbr tbt tbu tbv tca tcb tcc tce tck tcn tcr tct tcu tcv te- tea teb tec tee tek ten ter tet teu tev tka tkb tkc tke tkk tkr tkt tna tnb tnc tne tnk tnn tnr tnt tra trb trc tre trk trn trr trt tru trv tta ttb ttc tte ttk ttn ttr ttt ttu ttv tua tub tuc tue tuk tun tur tut tuu tuv tva tvb tvc tve tvk tvn tvr tvt tvu ua- uaa uab uac uae uak uan uar uat uau uav uba ubb ubc ube ubk ubn ubr ubt ubu ubv uca ucb ucc uce uck ucn ucr uct ucu ucv 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 unv ur- ura urb urc ure urk urn urr urt uru uta utb utc ute utk utn utr utt utu utv uua uuc uue uun uur uut uuu uva uvb uvc uve uvu uvv v-a v-e vaa vab vac vae vak van var vat vau vav vba vbc vbk vbr vbv vca vcc vce vcn vcr vct vcu vea veb vec vee vek ven ver vet veu vka vkb vkt vn- vna vnr vnu vnv vra vrb vrc vre vrk vrn vrr vrt vru vta vtb vtc vte vtk vtr vtt vtu vtv vue vuk vur vut vuv vva vvb vvc vvr vvt vvv