a-a a-b a-c aaa aab aac aae aah aak aau ab- aba abb abc abe abh abk abu ac- aca acb acc ace ach ack acu aea aeb aec aee aeh aek aeu aha ahb ahc ahe ahh ahk ahu aka akb akc ake akh akk aku au- aua aub auc aue auh auk b-u baa bab bac bae bah bak bau bba bbb bbc bbe bbh bbk bbu bca bcb bcc bce bch bck bcu be- bea beb bec bee beh bek beu bha bhb bhc bhe bhh bhk bhu bka bkb bkc bke bkk bua bub buc bue buh buk buu c-- caa cab cac cae cah cak cau cba cbb cbc cbe cbh cbk cbu cca ccb ccc cce cch cck ccu ce- cea ceb cec cee ceh cek ceu ch- cha chb chc che chh chk chu cka ckb ckc ckh cua cub cuc cue cuh cuk cuu eaa eab eac eae eah eak eau eba ebb ebc ebe ebh ebk ebu ec- eca ecb ecc ece ech eck ecu eea eeb eec eee eek eha ehb ehc ehe ehh ehu eka ekb ekc eke ekh eku eu- eua eub euc eue haa hab hac hae hah hak hau hba hbb hbc hbe hbh hbk hbu hca hcb hcc hce hch hck he- hea heb hec hee heh hek heu hha hhb hhc hhe hhh hhk hhu hka hkb hkh hkk hku hua hub huc hue huh huk huu ka- kaa kab kac kae kah kak kau kba kbb kbc kbe kbh kbk kbu kca kcb kcc kce kch kck kcu ke- kea keb kec kee keh kek kha khe khh khk khu kkb kkc kke kkh kkk kku kub kuc kue kuh kuk kuu ua- uaa uab uac uae uah uak uau uba ubb ubc ube ubh ubk ubu uca ucb ucc uce uch uck ucu uea ueb uec uee ueh uha uhb uhc uhe uhh uhu uka ukb ukc uke ukk uku uua uuc uue uuu