-er c-- ccc cce ccm ccn ccr cct ce- cec cee cem cen cer cet cmc cme cmm cmn cmr cmt cn- cnc cne cnm cnn cnr cnt crc cre crm crn crr crt ctc cte ctm ctn ctr ctt ec- ecc ece ecm ecn ecr ect eec eee eem een eer eet em- emc eme emm emn emr emt en- enc ene enm enn enr ent erc ere erm ern err ert etc ete etm etn etr ett m-r mc- mcc mce mcm mcn mcr mct mec mee mem men mer met mmc mme mmm mmn mmr mmt mnc mne mnm mnn mnr mnt mrc mre mrm mrn mrr mrt mtc mte mtm mtn mtr mtt ncc nce ncm ncn ncr nct ne- nec nee nem nen ner net nmc nme nmm nmn nmr nmt nnc nne nnm nnn nnt nrc nre nrm nrn nrr nrt ntc nte ntm ntn ntr ntt rcc rce rcm rcn rcr rct re- rec ree rem ren rer ret rmc rme rmm rmn rmr rmt rnc rnm rnn rnr rnt rrc rrm rrn rrr rrt rtc rte rtm rtn rtr rtt tcc tce tcm tcn tcr tct te- tec tee tem ten ter tet tmc tme tmm tmn tmr tmt tnc tne tnm tnn tnr tnt trc tre trm trn trr trt ttc tte ttm ttn ttr ttt