-er a-a a-b a-q a-z aaa aab aae aaq aar aaz ab- aba abb abe abq abr abz aea aeb aee aeq aer aez aqa aqr ar- ara arb are arq arr arz az- aza azb aze azq azz baa bab bae baq bar baz bba bbb bbe bbq bbr be- bea beb bee beq ber bez bqe bra brb bre brq brr brz bza bze bzr bzz eaa eab eae ear eaz eba ebb ebe ebq ebr eea eeb eee eer eqa eqe eqq era erb ere erq err erz eze ezr ezz qaa qar qaz qba qbe qbq qee qqq qra qrb qre ra- raa rab rae raq rar raz rba rbb rbe rbr re- rea reb ree req rer rez rra rrb rrq rrr rza rzb rze zaa zab zaq zar zaz zbb zbr zea zeb zee zeq zer zez zzr zzz