-er a-a a-c a-t aaa aac aae aam aan aar aat aax ac- aca acc ace acm acn acr act acx aea aec aee aem aen aer aet aex ama amc ame amm amn amr amt amx an- ana anc ane anm ann anr ant anx ar- ara arc are arm arn arr art arx at- ata atc ate atm atn atr att atx ax- axa axe axm axn axr axt axx c-- caa cac cae cam can car cat cax cca ccc cce ccm ccn ccr cct ccx ce- cea cec cee cem cen cer cet cex cma cmc cme cmm cmn cmr cmt cmx cn- cna cnc cne cnm cnn cnr cnt cnx cra crc cre crm crn crr crt crx cta ctc cte ctm ctn ctr ctt ctx cxc cxr cxt cxx eaa eac eae eam ean ear eat eax ec- eca ecc ece ecm ecn ecr ect ecx eea eec eee eem een eer eet eex em- ema emc eme emm emn emr emt emx en- ena enc ene enm enn enr ent era erc ere erm ern err ert eta etc ete etm etn etr ett etx ex- exa exc exe exr ext exx m-r maa mac mae mam man mar mat max mc- mca mcc mce mcm mcn mcr mct mcx mea mec mee mem men mer met mex mma mmc mme mmm mmn mmr mmt mmx mna mnc mne mnm mnn mnr mnt mra mrc mre mrm mrn mrr mrt mrx mta mtc mte mtm mtn mtr mtt mtx mxa mxc mxn mxr naa nac nae nam nan nar nat nax nca ncc nce ncm ncn ncr nct ncx ne- nea nec nee nem nen ner net nex nma nmc nme nmm nmn nmr nmt nna nnc nne nnm nnn nnt nra nrc nre nrm nrn nrr nrt nrx nta ntc nte ntm ntn ntr ntt ntx nxc nxt ra- raa rac rae ram ran rar rat rax rca rcc rce rcm rcn rcr rct rcx re- rea rec ree rem ren rer ret rex rma rmc rme rmm rmn rmr rmt rmx rna rnc rnm rnn rnr rnt rra rrc rrm rrn rrr rrt rta rtc rte rtm rtn rtr rtt rtx rxr t-x taa tac tae tam tan tar tat tax tca tcc tce tcm tcn tcr tct tcx te- tea tec tee tem ten ter tet tex tma tmc tme tmm tmn tmr tmt tmx tna tnc tne tnm tnn tnr tnt tnx tra trc tre trm trn trr trt trx tta ttc tte ttm ttn ttr ttt ttx txe txn txt xaa xac xam xan xar xat xcr xcx xee xem xen xer xet xex xma xmc xmm xmr xmt xmx xna xnc xrc xrt xrx xtc xtm xtr xtx xxx