a-a a-b a-c aaa aab aac aad aae aah aak aau ab- aba abb abc abd abe abh abk abu ac- aca acb acc acd ace ach ack acu ad- ada adb adc add ade adh adk adu aea aeb aec aed aee aeh aek aeu aha ahb ahc ahd ahe ahh ahk ahu aka akb akc akd ake akh akk aku au- aua aub auc aud aue auh auk b-u baa bab bac bad bae bah bak bau bba bbb bbc bbd bbe bbh bbk bbu bca bcb bcc bcd bce bch bck bcu bda bdb bdc bdd bde bdh bdk bdu be- bea beb bec bed bee beh bek beu bha bhb bhc bhd bhe bhh bhk bhu bka bkb bkc bke bkk bua bub buc bud bue buh buk buu c-- caa cab cac cad cae cah cak cau cba cbb cbc cbd cbe cbh cbk cbu cca ccb ccc ccd cce cch cck ccu cda cdb cdc cdd cde cdh cdk cdu ce- cea ceb cec ced cee ceh cek ceu ch- cha chb chc chd che chh chk chu cka ckb ckc ckd ckh cua cub cuc cud cue cuh cuk cuu daa dab dac dad dae dah dak dau dba dbb dbc dbd dbe dbh dbk dbu dca dcb dcc dcd dce dck dcu dda ddb ddc ddd dde ddh ddk ddu de- dea deb dec ded dee deh dek deu dh- dha dhb dhc dhd dhe dhh dhk dhu dka dkb dkc dke dkk dku dua dub duc dud due duh duk eaa eab eac ead eae eah eak eau eba ebb ebc ebd ebe ebh ebk ebu ec- eca ecb ecc ecd ece ech eck ecu ed- eda edb edc edd ede edh edk edu eea eeb eec eed eee eek eha ehb ehc ehd ehe ehh ehu eka ekb ekc ekd eke ekh eku eu- eua eub euc eud eue haa hab hac had hae hah hak hau hba hbb hbc hbd hbe hbh hbk hbu hca hcb hcc hcd hce hch hck hda hdb hdc hdd hde hdh hdk hdu he- hea heb hec hed hee heh hek heu hha hhb hhc hhd hhe hhh hhk hhu hka hkb hkd hkh hkk hku hua hub huc hud hue huh huk huu ka- kaa kab kac kad kae kah kak kau kba kbb kbc kbd kbe kbh kbk kbu kca kcb kcc kcd kce kch kck kcu kda kdb kdc kde kdh kdk kdu ke- kea keb kec ked kee keh kek kha khe khh khk khu kkb kkc kke kkh kkk kku kub kuc kud kue kuh kuk kuu ua- uaa uab uac uad uae uah uak uau uba ubb ubc ube ubh ubk ubu uca ucb ucc ucd uce uch uck ucu uda udb udc udd ude udk udu uea ueb uec ued uee ueh uha uhb uhc uhd uhe uhh uhu uka ukb ukc uke ukk uku uua uuc uue uuu