-er a-a a-b a-z aaa aab aae aak aar aav aaz ab- aba abb abe abk abr abv abz aea aeb aee aek aer aev aez aka akb ake akk akr akv ar- ara arb are ark arr arv arz av- ava avb ave avk avr avz az- aza azb aze azz baa bab bae bak bar bav baz bba bbb bbe bbk bbr be- bea beb bee bek ber bev bez bka bkb bke bkk bkr bkv bra brb bre brk brr brv brz bva bvb bve bvk bvr bvv bza bze bzr bzz eaa eab eae eak ear eav eaz eba ebb ebe ebk ebr ebv eea eeb eee eek eer eev eka ekb eke ekr ekv era erb ere erk err erv erz eva evb eve evr evv eze ezr ezz k-z ka- kaa kab kae kak kar kav kaz kba kbb kbe kbk kbr kbz ke- kea keb kee kek ker kev kez kkb kke kkk kkr kkv kra krk krr krv kva kvb kvk kvr kvv ra- raa rab rae rak rar rav raz rba rbb rbe rbk rbr re- rea reb ree rek rer rev rez rkb rke rkk rkv rkz rra rrb rrk rrr rva rvb rve rvr rvv rza rzb rze v-a v-e vaa vab vae vak var vav vaz vba vbk vbr vbv vbz vea veb vee vek ver vez vka vkb vra vrb vre vrk vrr vva vvb vvr vvv vvz zaa zab zak zar zav zaz zbb zbr zbv zea zeb zee zek zer zev zez zka zzr zzz