-er a-a a-b aaa aab aad aae aak aam aan aar ab- aba abb abd abe abk abm abn abr ad- ada adb add ade adk adm adn adr aea aeb aed aee aek aem aen aer aka akb akd ake akk akm akn akr ama amb amd ame amk amm amn amr an- ana anb and ane ank anm ann anr ar- ara arb ard are ark arm arn arr baa bab bad bae bak bam ban bar bba bbb bbd bbe bbk bbm bbn bbr bda bdb bdd bde bdk bdm bdr be- bea beb bed bee bek bem ben ber bka bkb bke bkk bkm bkn bkr bma bmb bmd bme bmk bmm bmn bmr bna bnb bnd bne bnk bnn bnr bra brb brd bre brk brm brn brr daa dab dad dae dak dam dan dar dba dbb dbd dbe dbk dbm dbn dbr dda ddb ddd dde ddk ddm ddn ddr de- dea deb ded dee dek dem den der dka dkb dke dkk dkm dkr dma dmb dmd dme dmk dmm dmn dmr dna dnb dnd dne dnk dnm dnn dnr dra drb drd dre drk drm drn drr eaa eab ead eae eak eam ean ear eba ebb ebd ebe ebk ebm ebn ebr ed- eda edb edd ede edk edm edn edr eea eeb eed eee eek eem een eer eka ekb ekd eke ekr em- ema emb emd eme emk emm emn emr en- ena enb end ene enk enm enn enr era erb erd ere erk erm ern err ka- kaa kab kad kae kak kam kan kar kba kbb kbd kbe kbk kbm kbn kbr kda kdb kde kdk kdm kdr ke- kea keb ked kee kek kem ken ker kkb kke kkk kkm kkn kkr kma kmb kmd kme kmk kmm kn- kna knd kne knk knm knn knr kra krd krk krn krr m-r maa mab mad mae mak mam man mar mba mbb mbd mbe mbk mbm mbr mda mdb mdd mde mdk mdm mdn mdr mea meb med mee mek mem men mer mka mkb mkd mke mkk mkm mkn mkr mma mmb mmd mme mmk mmm mmn mmr mna mnb mne mnk mnm mnn mnr mra mrb mrd mre mrk mrm mrn mrr naa nab nad nae nak nam nan nar nba nbb nbd nbe nbk nbm nbn nbr nda ndb ndd nde ndk ndm ndn ndr ne- nea neb ned nee nek nem nen ner nka nke nkk nkm nkn nkr nma nmb nmd nme nmk nmm nmn nmr nna nnb nne nnk nnm nnn nra nrb nrd nre nrk nrm nrn nrr ra- raa rab rad rae rak ram ran rar rba rbb rbd rbe rbk rbm rbn rbr rda rdb rdd rde rdm rdn rdr re- rea reb red ree rek rem ren rer rkb rke rkk rkm rma rmb rmd rme rmm rmn rmr rna rnb rnd rnm rnn rnr rra rrb rrd rrk rrm rrn rrr