-er a-a a-b a-i aaa aab aae aai aam aar aau aax ab- aba abb abe abi abm abr abu abx aea aeb aee aei aem aer aeu aex ai- aia aib aie aii aim air aiu aix ama amb ame ami amm amr amu amx ar- ara arb are ari arm arr aru arx au- aua aub aue aui aum aur aux ax- axa axe axi axm axr axx b-u baa bab bae bai bam bar bau bax bba bbb bbe bbi bbm bbr bbu bbx be- bea beb bee bei bem ber beu bex bi- bia bib bie bii bim bir biu bix bma bmb bme bmi bmm bmr bmu bmx bra brb bre bri brm brr bru brx bua bub bue bui bum bur buu bux bxb bxi bxm bxx eaa eab eae eai eam ear eau eax eba ebb ebe ebi ebm ebr ebu ebx eea eeb eee eem eer eex eia eib eie eii eim eir eiu eix em- ema emb eme emi emm emr emu emx era erb ere eri erm err eru eu- eua eub eue eui eur eux ex- exa exe exi exr exu exx ia- iaa iab iae iai iam iar iau iba ibb ibe ibi ibm ibr ibu ibx ie- iea iee iei iem ier iex iia iib iie iii iim iir iiu iix im- ima imb ime imi imm imu imx ir- ira irb ire iri irm irr iru irx iu- iua iub iue iui ium iur ixe ixi m-r maa mab mae mai mam mar mau max mba mbb mbe mbi mbm mbr mbu mbx mea meb mee mei mem mer meu mex mi- mia mib mie mii mim mir miu mix mma mmb mme mmi mmm mmr mmu mmx mra mrb mre mri mrm mrr mru mrx mua mub mue mui mum mur muu mux mxa mxi mxr mxu ra- raa rab rae rai ram rar rau rax rba rbb rbe rbi rbm rbr rbu rbx re- rea reb ree rei rem rer reu rex ria rib rie rii rim rir rix rma rmb rme rmi rmm rmr rmx rra rrb rri rrm rrr rru rua rub rue rui rum rur ruu rux rxr ua- uaa uab uae uai uam uar uau uba ubb ube ubi ubr ubu ubx uea ueb uee uei uem uer uia uib uie uii uim uir uiu um- uma umb ume umi umm umr umu ur- ura urb ure uri urm urr uru urx uua uue uum uur uuu uxb uxr uxu xaa xam xar xau xbe xbr xbx xee xem xer xeu xex xia xie xii xiu xix xma xmi xmm xmr xmu xmx xrx xue xui xxi xxx