a-a a-b a-z aaa aab aad aae aak aaz ab- aba abb abd abe abk abz ad- ada adb add ade adk adz aea aeb aed aee aek aez aka akb akd ake akk az- aza azb azd aze azz baa bab bad bae bak baz bba bbb bbd bbe bbk bda bdb bdd bde bdk bdz be- bea beb bed bee bek bez bka bkb bke bkk bza bzd bze bzz daa dab dad dae dak daz dba dbb dbd dbe dbk dbz dda ddb ddd dde ddk ddz de- dea deb ded dee dek dez dka dkb dke dkk dza dzb dzd dze eaa eab ead eae eak eaz eba ebb ebd ebe ebk ed- eda edb edd ede edk eea eeb eed eee eek eka ekb ekd eke eze ezz k-z ka- kaa kab kad kae kak kaz kba kbb kbd kbe kbk kbz kda kdb kde kdk ke- kea keb ked kee kek kez kkb kke kkk zaa zab zad zak zaz zbb zea zeb zed zee zek zez zka zzz