a-a a-b a-z aaa aab aae aaj aak aaz ab- aba abb abe abj abk abz aea aeb aee aej aek aez aja ajb aje ajj ajk aka akb ake akj akk az- aza azb aze azz baa bab bae baj bak baz bba bbb bbe bbk be- bea beb bee bek bez bja bjj bjk bka bkb bke bkk bza bze bzz eaa eab eae eaj eak eaz eba ebb ebe ebj ebk eea eeb eee eek eja eka ekb eke eze ezz j-z jaa jab jae jaj jak jaz jba jbj jbk jbz jea jeb jee jej jek jez jja jjb jjj jjk jka jkb jkk k-z ka- kaa kab kae kaj kak kaz kba kbb kbe kbk kbz ke- kea keb kee kek kez kjb kje kkb kke kkk zaa zab zaj zak zaz zbb zea zeb zee zek zez zje zka zzz