a-a a-b a-c a-z aaa aab aac aae aah aaz ab- aba abb abc abe abh abz ac- aca acb acc ace ach acz aea aeb aec aee aeh aez aha ahb ahc ahe ahh ahz az- aza azb aze azz baa bab bac bae bah baz bba bbb bbc bbe bbh bca bcb bcc bce bch bcz be- bea beb bec bee beh bez bha bhb bhc bhe bhh bza bze bzh bzz c-- caa cab cac cae cah caz cba cbb cbc cbe cbh cbz cca ccb ccc cce cch ccz ce- cea ceb cec cee ceh cez ch- cha chb chc che chh chz cz- czc cze eaa eab eac eae eah eaz eba ebb ebc ebe ebh ec- eca ecb ecc ece ech eea eeb eec eee eha ehb ehc ehe ehh eze ezh ezz haa hab hac hae hah haz hba hbb hbc hbe hbh hbz hca hcb hcc hce hch he- hea heb hec hee heh hez hha hhb hhc hhe hhh hhz hze zaa zab zac zah zaz zbb zbc zce zea zeb zec zee zeh zez zha zhc zhe zzz