a-a a-b a-c a-t aaa aab aac aad aae aak aan aat aau ab- aba abb abc abd abe abk abn abt abu ac- aca acb acc acd ace ack acn act acu ad- ada adb adc add ade adk adn adt adu aea aeb aec aed aee aek aen aet aeu aka akb akc akd ake akk akn aku an- ana anb anc and ane ank ann ant anu at- ata atb atc atd ate atn att atu au- aua aub auc aud aue auk aun aut b-u baa bab bac bad bae bak ban bat bau bba bbb bbc bbd bbe bbk bbn bbt bbu bca bcb bcc bcd bce bck bcn bct bcu bda bdb bdc bdd bde bdk bdt bdu be- bea beb bec bed bee bek ben bet beu bka bkb bkc bke bkk bkn bkt bna bnb bnc bnd bne bnk bnn bnt bnu bta btb btc btd bte btk btn btt btu bua bub buc bud bue buk bun but buu c-- caa cab cac cad cae cak can cat cau cba cbb cbc cbd cbe cbk cbn cbt cbu cca ccb ccc ccd cce cck ccn cct ccu cda cdb cdc cdd cde cdk cdn cdt cdu ce- cea ceb cec ced cee cek cen cet ceu cka ckb ckc ckd ckt cn- cna cnb cnc cnd cne cnn cnt cnu cta ctb ctc ctd cte ctk ctn ctt ctu cua cub cuc cud cue cuk cun cut cuu daa dab dac dad dae dak dan dat dau dba dbb dbc dbd dbe dbk dbn dbt dbu dca dcb dcc dcd dce dck dcn dct dcu dda ddb ddc ddd dde ddk ddn ddt ddu de- dea deb dec ded dee dek den det deu dka dkb dkc dke dkk dkt dku dna dnb dnc dnd dne dnk dnn dnt dta dtb dtc dtd dte dtk dtn dtt dtu dua dub duc dud due duk dun dut eaa eab eac ead eae eak ean eat eau eba ebb ebc ebd ebe ebk ebn ebt ebu ec- eca ecb ecc ecd ece eck ecn ect ecu ed- eda edb edc edd ede edk edn edt edu eea eeb eec eed eee eek een eet eka ekb ekc ekd eke ekt eku en- ena enb enc end ene enk enn ent enu eta etb etc etd ete etk etn ett etu eu- eua eub euc eud eue eun eut k-t ka- kaa kab kac kad kae kak kan kat kau kba kbb kbc kbd kbe kbk kbn kbu kca kcb kcc kcd kce kck kcn kct kcu kda kdb kdc kde kdk kdt kdu ke- kea keb kec ked kee kek ken ket kkb kkc kke kkk kkn kkt kku kn- kna knc knd kne knk knn knt knu kta ktb ktc kte ktk ktn ktt ktu kub kuc kud kue kuk kun kut kuu naa nab nac nad nae nak nan nat nau nba nbb nbc nbd nbe nbk nbn nbt nbu nca ncb ncc ncd nce nck ncn nct ncu nda ndb ndc ndd nde ndk ndn ndt ndu ne- nea neb nec ned nee nek nen net neu nka nkc nke nkk nkn nkt nku nna nnb nnc nne nnk nnn nnt nnu nta ntb ntc ntd nte ntk ntn ntt ntu nua nub nuc nud nue nuk nun nut nuu taa tab tac tad tae tak tan tat tau tba tbb tbc tbd tbe tbk tbn tbt tbu tca tcb tcc tcd tce tck tcn tct tcu tda tdb tdc tdd tde tdk tdn tdt tdu te- tea teb tec ted tee tek ten tet teu tka tkb tkc tke tkk tkt tna tnb tnc tnd tne tnk tnn tnt tta ttb ttc ttd tte ttk ttn ttt ttu tua tub tuc tud tue tuk tun tut tuu ua- uaa uab uac uad uae uak uan uat uau uba ubb ubc ube ubk ubn ubt ubu uca ucb ucc ucd uce uck ucn uct ucu uda udb udc udd ude udk udn udt udu uea ueb uec ued uee uen uet uka ukb ukc uke ukk ukn uku un- una unb unc und une unk unn unt unu uta utb utc utd ute utk utn utt utu uua uuc uue uun uut uuu