-er a-a a-b a-q aaa aab aad aae aan aaq aar ab- aba abb abd abe abn abq abr ad- ada adb add ade adn adq adr aea aeb aed aee aen aeq aer an- ana anb and ane ann anq anr aqa aqn aqr ar- ara arb ard are arn arq arr baa bab bad bae ban baq bar bba bbb bbd bbe bbn bbq bbr bda bdb bdd bde bdq bdr be- bea beb bed bee ben beq ber bna bnb bnd bne bnn bnr bqd bqe bra brb brd bre brn brq brr daa dab dad dae dan daq dar dba dbb dbd dbe dbn dbq dbr dda ddb ddd dde ddn ddq ddr de- dea deb ded dee den deq der dna dnb dnd dne dnn dnq dnr dqa dqe dqn dra drb drd dre drn drq drr eaa eab ead eae ean ear eba ebb ebd ebe ebn ebq ebr ed- eda edb edd ede edn edr eea eeb eed eee een eer en- ena enb end ene enn enr eqa eqe eqn eqq era erb erd ere ern erq err naa nab nad nae nan nar nba nbb nbd nbe nbn nbr nda ndb ndd nde ndn ndr ne- nea neb ned nee nen ner nna nnb nne nnn nra nrb nrd nre nrn nrr qaa qad qan qar qba qbd qbe qbq qda qdb qdr qed qee qen qnb qnd qne qqq qra qrb qre ra- raa rab rad rae ran raq rar rba rbb rbd rbe rbn rbr rda rdb rdd rde rdn rdr re- rea reb red ree ren req rer rna rnb rnd rnn rnr rqn rra rrb rrd rrn rrq rrr