a-a a-b a-c a-t aaa aab aac aad aae aan aat ab- aba abb abc abd abe abn abt ac- aca acb acc acd ace acn act ad- ada adb adc add ade adn adt aea aeb aec aed aee aen aet an- ana anb anc and ane ann ant at- ata atb atc atd ate atn att baa bab bac bad bae ban bat bba bbb bbc bbd bbe bbn bbt bca bcb bcc bcd bce bcn bct bda bdb bdc bdd bde bdt be- bea beb bec bed bee ben bet bna bnb bnc bnd bne bnn bnt bta btb btc btd bte btn btt c-- caa cab cac cad cae can cat cba cbb cbc cbd cbe cbn cbt cca ccb ccc ccd cce ccn cct cda cdb cdc cdd cde cdn cdt ce- cea ceb cec ced cee cen cet cn- cna cnb cnc cnd cne cnn cnt cta ctb ctc ctd cte ctn ctt daa dab dac dad dae dan dat dba dbb dbc dbd dbe dbn dbt dca dcb dcc dcd dce dcn dct dda ddb ddc ddd dde ddn ddt de- dea deb dec ded dee den det dna dnb dnc dnd dne dnn dnt dta dtb dtc dtd dte dtn dtt eaa eab eac ead eae ean eat eba ebb ebc ebd ebe ebn ebt ec- eca ecb ecc ecd ece ecn ect ed- eda edb edc edd ede edn edt eea eeb eec eed eee een eet en- ena enb enc end ene enn ent eta etb etc etd ete etn ett naa nab nac nad nae nan nat nba nbb nbc nbd nbe nbn nbt nca ncb ncc ncd nce ncn nct nda ndb ndc ndd nde ndn ndt ne- nea neb nec ned nee nen net nna nnb nnc nne nnn nnt nta ntb ntc ntd nte ntn ntt taa tab tac tad tae tan tat tba tbb tbc tbd tbe tbn tbt tca tcb tcc tcd tce tcn tct tda tdb tdc tdd tde tdn tdt te- tea teb tec ted tee ten tet tna tnb tnc tnd tne tnn tnt tta ttb ttc ttd tte ttn ttt