-er a-a a-b a-i aaa aab aad aae aai aam aar ab- aba abb abd abe abi abm abr ad- ada adb add ade adi adm adr aea aeb aed aee aei aem aer ai- aia aib aid aie aii aim air ama amb amd ame ami amm amr ar- ara arb ard are ari arm arr baa bab bad bae bai bam bar bba bbb bbd bbe bbi bbm bbr bda bdb bdd bde bdi bdm bdr be- bea beb bed bee bei bem ber bi- bia bib bid bie bii bim bir bma bmb bmd bme bmi bmm bmr bra brb brd bre bri brm brr daa dab dad dae dai dam dar dba dbb dbd dbe dbi dbm dbr dda ddb ddd dde ddi ddm ddr de- dea deb ded dee dei dem der di- dia dib did die dii dim dir dma dmb dmd dme dmi dmm dmr dra drb drd dre dri drm drr eaa eab ead eae eai eam ear eba ebb ebd ebe ebi ebm ebr ed- eda edb edd ede edi edm edr eea eeb eed eee eem eer eia eib eid eie eii eim eir em- ema emb emd eme emi emm emr era erb erd ere eri erm err i-d ia- iaa iab iad iae iai iam iar iba ibb ibd ibe ibi ibm ibr ida idb idd ide idi idm idr ie- iea ied iee iei iem ier iia iib iid iie iii iim iir im- ima imb imd ime imi imm ir- ira irb ird ire iri irm irr m-r maa mab mad mae mai mam mar mba mbb mbd mbe mbi mbm mbr mda mdb mdd mde mdi mdm mdr mea meb med mee mei mem mer mi- mia mib mid mie mii mim mir mma mmb mmd mme mmi mmm mmr mra mrb mrd mre mri mrm mrr ra- raa rab rad rae rai ram rar rba rbb rbd rbe rbi rbm rbr rda rdb rdd rde rdi rdm rdr re- rea reb red ree rei rem rer ria rib rid rie rii rim rir rma rmb rmd rme rmi rmm rmr rra rrb rrd rri rrm rrr