a-a a-b a-c a-z aaa aab aac aae aah aak aaz ab- aba abb abc abe abh abk abz ac- aca acb acc ace ach ack acz aea aeb aec aee aeh aek aez aha ahb ahc ahe ahh ahk ahz aka akb akc ake akh akk az- aza azb aze azz baa bab bac bae bah bak baz bba bbb bbc bbe bbh bbk bca bcb bcc bce bch bck bcz be- bea beb bec bee beh bek bez bha bhb bhc bhe bhh bhk bka bkb bkc bke bkk bza bze bzh bzz c-- caa cab cac cae cah cak caz cba cbb cbc cbe cbh cbk cbz cca ccb ccc cce cch cck ccz ce- cea ceb cec cee ceh cek cez ch- cha chb chc che chh chk chz cka ckb ckc ckh cz- czc cze czk eaa eab eac eae eah eak eaz eba ebb ebc ebe ebh ebk ec- eca ecb ecc ece ech eck eea eeb eec eee eek eha ehb ehc ehe ehh eka ekb ekc eke ekh eze ezh ezz haa hab hac hae hah hak haz hba hbb hbc hbe hbh hbk hbz hca hcb hcc hce hch hck he- hea heb hec hee heh hek hez hha hhb hhc hhe hhh hhk hhz hka hkb hkh hkk hze k-z ka- kaa kab kac kae kah kak kaz kba kbb kbc kbe kbh kbk kbz kca kcb kcc kce kch kck ke- kea keb kec kee keh kek kez kha khe khh khk khz kkb kkc kke kkh kkk zaa zab zac zah zak zaz zbb zbc zce zea zeb zec zee zeh zek zez zha zhc zhe zka zzz