-er c-- ccc cce ccm ccn ccr cct ccx ce- cec cee cem cen cer cet cex cmc cme cmm cmn cmr cmt cmx cn- cnc cne cnm cnn cnr cnt cnx crc cre crm crn crr crt crx ctc cte ctm ctn ctr ctt ctx cxc cxr cxt cxx ec- ecc ece ecm ecn ecr ect ecx eec eee eem een eer eet eex em- emc eme emm emn emr emt emx en- enc ene enm enn enr ent erc ere erm ern err ert etc ete etm etn etr ett etx ex- exc exe exr ext exx m-r mc- mcc mce mcm mcn mcr mct mcx mec mee mem men mer met mex mmc mme mmm mmn mmr mmt mmx mnc mne mnm mnn mnr mnt mrc mre mrm mrn mrr mrt mrx mtc mte mtm mtn mtr mtt mtx mxc mxn mxr ncc nce ncm ncn ncr nct ncx ne- nec nee nem nen ner net nex nmc nme nmm nmn nmr nmt nnc nne nnm nnn nnt nrc nre nrm nrn nrr nrt nrx ntc nte ntm ntn ntr ntt ntx nxc nxt rcc rce rcm rcn rcr rct rcx re- rec ree rem ren rer ret rex rmc rme rmm rmn rmr rmt rmx rnc rnm rnn rnr rnt rrc rrm rrn rrr rrt rtc rte rtm rtn rtr rtt rtx rxr t-x tcc tce tcm tcn tcr tct tcx te- tec tee tem ten ter tet tex tmc tme tmm tmn tmr tmt tmx tnc tne tnm tnn tnr tnt tnx trc tre trm trn trr trt trx ttc tte ttm ttn ttr ttt ttx txe txn txt xcr xcx xee xem xen xer xet xex xmc xmm xmr xmt xmx xnc xrc xrt xrx xtc xtm xtr xtx xxx