-er a-a a-t aaa aae aam aar aat aax aea aee aem aer aet aex ama ame amm amr amt amx ar- ara are arm arr art arx at- ata ate atm atr att atx ax- axa axe axm axr axt axx eaa eae eam ear eat eax eea eee eem eer eet eex em- ema eme emm emr emt emx era ere erm err ert eta ete etm etr ett etx ex- exa exe exr ext exx m-r maa mae mam mar mat max mea mee mem mer met mex mma mme mmm mmr mmt mmx mra mre mrm mrr mrt mrx mta mte mtm mtr mtt mtx mxa mxr ra- raa rae ram rar rat rax re- rea ree rem rer ret rex rma rme rmm rmr rmt rmx rra rrm rrr rrt rta rte rtm rtr rtt rtx rxr t-x taa tae tam tar tat tax te- tea tee tem ter tet tex tma tme tmm tmr tmt tmx tra tre trm trr trt trx tta tte ttm ttr ttt ttx txe txt xaa xam xar xat xee xem xer xet xex xma xmm xmr xmt xmx xrt xrx xtm xtr xtx xxx