a-a a-b a-c aaa aab aac aad aae aan aau ab- aba abb abc abd abe abn abu ac- aca acb acc acd ace acn acu ad- ada adb adc add ade adn adu aea aeb aec aed aee aen aeu an- ana anb anc and ane ann anu au- aua aub auc aud aue aun b-u baa bab bac bad bae ban bau bba bbb bbc bbd bbe bbn bbu bca bcb bcc bcd bce bcn bcu bda bdb bdc bdd bde bdu be- bea beb bec bed bee ben beu bna bnb bnc bnd bne bnn bnu bua bub buc bud bue bun buu c-- caa cab cac cad cae can cau cba cbb cbc cbd cbe cbn cbu cca ccb ccc ccd cce ccn ccu cda cdb cdc cdd cde cdn cdu ce- cea ceb cec ced cee cen ceu cn- cna cnb cnc cnd cne cnn cnu cua cub cuc cud cue cun cuu daa dab dac dad dae dan dau dba dbb dbc dbd dbe dbn dbu dca dcb dcc dcd dce dcn dcu dda ddb ddc ddd dde ddn ddu de- dea deb dec ded dee den deu dna dnb dnc dnd dne dnn dua dub duc dud due dun eaa eab eac ead eae ean eau eba ebb ebc ebd ebe ebn ebu ec- eca ecb ecc ecd ece ecn ecu ed- eda edb edc edd ede edn edu eea eeb eec eed eee een en- ena enb enc end ene enn enu eu- eua eub euc eud eue eun naa nab nac nad nae nan nau nba nbb nbc nbd nbe nbn nbu nca ncb ncc ncd nce ncn ncu nda ndb ndc ndd nde ndn ndu ne- nea neb nec ned nee nen neu nna nnb nnc nne nnn nnu nua nub nuc nud nue nun nuu ua- uaa uab uac uad uae uan uau uba ubb ubc ube ubn ubu uca ucb ucc ucd uce ucn ucu uda udb udc udd ude udn udu uea ueb uec ued uee uen un- una unb unc und une unn unu uua uuc uue uun uuu