-er a-a a-b aaa aab aad aae aak aam aar ab- aba abb abd abe abk abm abr ad- ada adb add ade adk adm adr aea aeb aed aee aek aem aer aka akb akd ake akk akm akr ama amb amd ame amk amm amr ar- ara arb ard are ark arm arr baa bab bad bae bak bam bar bba bbb bbd bbe bbk bbm bbr bda bdb bdd bde bdk bdm bdr be- bea beb bed bee bek bem ber bka bkb bke bkk bkm bkr bma bmb bmd bme bmk bmm bmr bra brb brd bre brk brm brr daa dab dad dae dak dam dar dba dbb dbd dbe dbk dbm dbr dda ddb ddd dde ddk ddm ddr de- dea deb ded dee dek dem der dka dkb dke dkk dkm dkr dma dmb dmd dme dmk dmm dmr dra drb drd dre drk drm drr eaa eab ead eae eak eam ear eba ebb ebd ebe ebk ebm ebr ed- eda edb edd ede edk edm edr eea eeb eed eee eek eem eer eka ekb ekd eke ekr em- ema emb emd eme emk emm emr era erb erd ere erk erm err ka- kaa kab kad kae kak kam kar kba kbb kbd kbe kbk kbm kbr kda kdb kde kdk kdm kdr ke- kea keb ked kee kek kem ker kkb kke kkk kkm kkr kma kmb kmd kme kmk kmm kra krd krk krr m-r maa mab mad mae mak mam mar mba mbb mbd mbe mbk mbm mbr mda mdb mdd mde mdk mdm mdr mea meb med mee mek mem mer mka mkb mkd mke mkk mkm mkr mma mmb mmd mme mmk mmm mmr mra mrb mrd mre mrk mrm mrr ra- raa rab rad rae rak ram rar rba rbb rbd rbe rbk rbm rbr rda rdb rdd rde rdm rdr re- rea reb red ree rek rem rer rkb rke rkk rkm rma rmb rmd rme rmm rmr rra rrb rrd rrk rrm rrr