-er a-a a-b a-i aaa aab aad aae aai aam aar aax ab- aba abb abd abe abi abm abr abx ad- ada adb add ade adi adm adr adx aea aeb aed aee aei aem aer aex ai- aia aib aid aie aii aim air aix ama amb amd ame ami amm amr amx ar- ara arb ard are ari arm arr arx ax- axa axe axi axm axr axx baa bab bad bae bai bam bar bax bba bbb bbd bbe bbi bbm bbr bbx bda bdb bdd bde bdi bdm bdr bdx be- bea beb bed bee bei bem ber bex bi- bia bib bid bie bii bim bir bix bma bmb bmd bme bmi bmm bmr bmx bra brb brd bre bri brm brr brx bxb bxd bxi bxm bxx daa dab dad dae dai dam dar dax dba dbb dbd dbe dbi dbm dbr dbx dda ddb ddd dde ddi ddm ddr ddx de- dea deb ded dee dei dem der dex di- dia dib did die dii dim dir dix dma dmb dmd dme dmi dmm dmr dmx dra drb drd dre dri drm drr drx dxd dxi dxr dxx eaa eab ead eae eai eam ear eax eba ebb ebd ebe ebi ebm ebr ebx ed- eda edb edd ede edi edm edr edx eea eeb eed eee eem eer eex eia eib eid eie eii eim eir eix em- ema emb emd eme emi emm emr emx era erb erd ere eri erm err ex- exa exd exe exi exr exx i-d ia- iaa iab iad iae iai iam iar iba ibb ibd ibe ibi ibm ibr ibx ida idb idd ide idi idm idr idx ie- iea ied iee iei iem ier iex iia iib iid iie iii iim iir iix im- ima imb imd ime imi imm imx ir- ira irb ird ire iri irm irr irx ixe ixi m-r maa mab mad mae mai mam mar max mba mbb mbd mbe mbi mbm mbr mbx mda mdb mdd mde mdi mdm mdr mdx mea meb med mee mei mem mer mex mi- mia mib mid mie mii mim mir mix mma mmb mmd mme mmi mmm mmr mmx mra mrb mrd mre mri mrm mrr mrx mxa mxd mxi mxr ra- raa rab rad rae rai ram rar rax rba rbb rbd rbe rbi rbm rbr rbx rda rdb rdd rde rdi rdm rdr rdx re- rea reb red ree rei rem rer rex ria rib rid rie rii rim rir rix rma rmb rmd rme rmi rmm rmr rmx rra rrb rrd rri rrm rrr rxr xaa xad xam xar xbe xbr xbx xda xdb xde xdi xdm xdr xed xee xem xer xex xia xie xii xix xma xmd xmi xmm xmr xmx xrd xrx xxi xxx