-er a-a a-b a-t aaa aab aae aam aar aat aau aax ab- aba abb abe abm abr abt abu abx aea aeb aee aem aer aet aeu aex ama amb ame amm amr amt amu amx ar- ara arb are arm arr art aru arx at- ata atb ate atm atr att atu atx au- aua aub aue aum aur aut aux ax- axa axe axm axr axt axx b-u baa bab bae bam bar bat bau bax bba bbb bbe bbm bbr bbt bbu bbx be- bea beb bee bem ber bet beu bex bma bmb bme bmm bmr bmt bmu bmx bra brb bre brm brr brt bru brx bta btb bte btm btr btt btu btx bua bub bue bum bur but buu bux bxb bxm bxx eaa eab eae eam ear eat eau eax eba ebb ebe ebm ebr ebt ebu ebx eea eeb eee eem eer eet eex em- ema emb eme emm emr emt emu emx era erb ere erm err ert eru eta etb ete etm etr ett etu etx eu- eua eub eue eur eut eux ex- exa exe exr ext exu exx m-r maa mab mae mam mar mat mau max mba mbb mbe mbm mbr mbt mbu mbx mea meb mee mem mer met meu mex mma mmb mme mmm mmr mmt mmu mmx mra mrb mre mrm mrr mrt mru mrx mta mtb mte mtm mtr mtt mtu mtx mua mub mue mum mur mut muu mux mxa mxr mxu ra- raa rab rae ram rar rat rau rax rba rbb rbe rbm rbr rbt rbu rbx re- rea reb ree rem rer ret reu rex rma rmb rme rmm rmr rmt rmx rra rrb rrm rrr rrt rru rta rtb rte rtm rtr rtt rtu rtx rua rub rue rum rur rut ruu rux rxr t-x taa tab tae tam tar tat tau tax tba tbb tbe tbm tbr tbt tbu te- tea teb tee tem ter tet teu tex tma tmb tme tmm tmr tmt tmu tmx tra trb tre trm trr trt tru trx tta ttb tte ttm ttr ttt ttu ttx tua tub tue tum tur tut tuu tux txe txt txu ua- uaa uab uae uam uar uat uau uba ubb ube ubr ubt ubu ubx uea ueb uee uem uer uet um- uma umb ume umm umr umt umu ur- ura urb ure urm urr urt uru urx uta utb ute utm utr utt utu utx uua uue uum uur uut uuu uxb uxr uxt uxu xaa xam xar xat xau xbe xbr xbx xee xem xer xet xeu xex xma xmm xmr xmt xmu xmx xrt xrx xtm xtr xtx xue xxx