a-a a-b a-c aaa aab aac aae aan aau aav ab- aba abb abc abe abn abu abv ac- aca acb acc ace acn acu acv aea aeb aec aee aen aeu aev an- ana anb anc ane ann anu anv au- aua aub auc aue aun auv av- ava avb avc ave avn avu b-u baa bab bac bae ban bau bav bba bbb bbc bbe bbn bbu bca bcb bcc bce bcn bcu bcv be- bea beb bec bee ben beu bev bna bnb bnc bne bnn bnu bnv bua bub buc bue bun buu bva bvb bvc bve bvn bvu bvv c-- caa cab cac cae can cau cav cba cbb cbc cbe cbn cbu cbv cca ccb ccc cce ccn ccu ccv ce- cea ceb cec cee cen ceu cev cn- cna cnb cnc cne cnn cnu cnv cua cub cuc cue cun cuu cuv cva cvb cvc cve cvn cvu cvv eaa eab eac eae ean eau eav eba ebb ebc ebe ebn ebu ebv ec- eca ecb ecc ece ecn ecu ecv eea eeb eec eee een eev en- ena enb enc ene enn enu env eu- eua eub euc eue eun euv eva evb evc eve evn evv naa nab nac nae nan nau nav nba nbb nbc nbe nbn nbu nbv nca ncb ncc nce ncn ncu ncv ne- nea neb nec nee nen neu nev nna nnb nnc nne nnn nnu nnv nua nub nuc nue nun nuu nuv nva nvb nvc nve nvn nvu nvv ua- uaa uab uac uae uan uau uav uba ubb ubc ube ubn ubu ubv uca ucb ucc uce ucn ucu ucv uea ueb uec uee uen un- una unb unc une unn unu unv uua uuc uue uun uuu uva uvb uvc uve uvu uvv v-a v-e vaa vab vac vae van vau vav vba vbc vbv vca vcc vce vcn vcu vea veb vec vee ven veu vn- vna vnu vnv vue vuv vva vvb vvc vvv