-er c-- ccc cce ccn ccp ccr cct ce- cec cee cen cep cer cet cn- cnc cne cnn cnp cnr cnt cpc cpe cpn cpp cpr cpt crc cre crn crp crr crt ctc cte ctn ctp ctr ctt ec- ecc ece ecn ecr ect eec eee een eep eer eet en- enc ene enn enp enr ent ep- epc epe epn epp epr ept erc ere ern erp err ert etc ete etn etp etr ett ncc nce ncn ncp ncr nct ne- nec nee nen nep ner net nnc nne nnn nnp nnt npc npe npn npp npr npt nrc nre nrn nrp nrr nrt ntc nte ntn ntp ntr ntt p-p pcc pce pcn pcp pcr pct pec pee pen pep per pet pn- pnc pne pnn pnp pnr pnt ppc ppe ppn ppp ppr ppt prc pre prn prp prr prt pt- ptc pte ptn ptp ptr ptt rcc rce rcn rcp rcr rct re- rec ree ren rep rer ret rnc rnn rnp rnr rnt rpc rpe rpn rpp rpr rpt rrc rrn rrp rrr rrt rtc rte rtn rtp rtr rtt tcc tce tcn tcp tcr tct te- tec tee ten tep ter tet tnc tne tnn tnp tnr tnt tpc tpe tpn tpp tpr tpt trc tre trn trp trr trt ttc tte ttn ttp ttr ttt