-er a-a a-b a-z aaa aab aad aae aak aar aaz ab- aba abb abd abe abk abr abz ad- ada adb add ade adk adr adz aea aeb aed aee aek aer aez aka akb akd ake akk akr ar- ara arb ard are ark arr arz az- aza azb azd aze azz baa bab bad bae bak bar baz bba bbb bbd bbe bbk bbr bda bdb bdd bde bdk bdr bdz be- bea beb bed bee bek ber bez bka bkb bke bkk bkr bra brb brd bre brk brr brz bza bzd bze bzr bzz daa dab dad dae dak dar daz dba dbb dbd dbe dbk dbr dbz dda ddb ddd dde ddk ddr ddz de- dea deb ded dee dek der dez dka dkb dke dkk dkr dra drb drd dre drk drr drz dza dzb dzd dze dzr eaa eab ead eae eak ear eaz eba ebb ebd ebe ebk ebr ed- eda edb edd ede edk edr eea eeb eed eee eek eer eka ekb ekd eke ekr era erb erd ere erk err erz eze ezr ezz k-z ka- kaa kab kad kae kak kar kaz kba kbb kbd kbe kbk kbr kbz kda kdb kde kdk kdr ke- kea keb ked kee kek ker kez kkb kke kkk kkr kra krd krk krr ra- raa rab rad rae rak rar raz rba rbb rbd rbe rbk rbr rda rdb rdd rde rdr re- rea reb red ree rek rer rez rkb rke rkk rkz rra rrb rrd rrk rrr rza rzb rze zaa zab zad zak zar zaz zbb zbr zea zeb zed zee zek zer zez zka zzr zzz