-er c-- ccc cce ccm ccp ccr cct ce- cec cee cem cep cer cet cmc cme cmm cmp cmr cmt cpc cpe cpm cpp cpr cpt crc cre crm crp crr crt ctc cte ctm ctp ctr ctt ec- ecc ece ecm ecr ect eec eee eem eep eer eet em- emc eme emm emp emr emt ep- epc epe epm epp epr ept erc ere erm erp err ert etc ete etm etp etr ett m-r mc- mcc mce mcm mcp mcr mct mec mee mem mep mer met mmc mme mmm mmp mmr mmt mpc mpe mpm mpp mpr mpt mrc mre mrm mrp mrr mrt mtc mte mtm mtp mtr mtt p-p pcc pce pcm pcp pcr pct pec pee pem pep per pet pmc pme pmm pmp pmr pmt ppc ppe ppm ppp ppr ppt prc pre prm prp prr prt pt- ptc pte ptm ptp ptr ptt rcc rce rcm rcp rcr rct re- rec ree rem rep rer ret rmc rme rmm rmp rmr rmt rpc rpe rpm rpp rpr rpt rrc rrm rrp rrr rrt rtc rte rtm rtp rtr rtt tcc tce tcm tcp tcr tct te- tec tee tem tep ter tet tmc tme tmm tmp tmr tmt tpc tpe tpm tpp tpr tpt trc tre trm trp trr trt ttc tte ttm ttp ttr ttt