-er a-a a-c a-t aaa aac aae aan aap aar aat ac- aca acc ace acn acp acr act aea aec aee aen aep aer aet an- ana anc ane ann anp anr ant ap- apa apc ape apn app apr apt ar- ara arc are arn arp arr art at- ata atc ate atn atp atr att c-- caa cac cae can cap car cat cca ccc cce ccn ccp ccr cct ce- cea cec cee cen cep cer cet cn- cna cnc cne cnn cnp cnr cnt cpa cpc cpe cpn cpp cpr cpt cra crc cre crn crp crr crt cta ctc cte ctn ctp ctr ctt eaa eac eae ean eap ear eat ec- eca ecc ece ecn ecr ect eea eec eee een eep eer eet en- ena enc ene enn enp enr ent ep- epa epc epe epn epp epr ept era erc ere ern erp err ert eta etc ete etn etp etr ett naa nac nae nan nap nar nat nca ncc nce ncn ncp ncr nct ne- nea nec nee nen nep ner net nna nnc nne nnn nnp nnt npa npc npe npn npp npr npt nra nrc nre nrn nrp nrr nrt nta ntc nte ntn ntp ntr ntt p-p paa pac pae pan pap par pat pca pcc pce pcn pcp pcr pct pea pec pee pen pep per pet pn- pna pnc pne pnn pnp pnr pnt ppa ppc ppe ppn ppp ppr ppt pra prc pre prn prp prr prt pt- pta ptc pte ptn ptp ptr ptt ra- raa rac rae ran rap rar rat rca rcc rce rcn rcp rcr rct re- rea rec ree ren rep rer ret rna rnc rnn rnp rnr rnt rpa rpc rpe rpn rpp rpr rpt rra rrc rrn rrp rrr rrt rta rtc rte rtn rtp rtr rtt taa tac tae tan tap tar tat tca tcc tce tcn tcp tcr tct te- tea tec tee ten tep ter tet tna tnc tne tnn tnp tnr tnt tpa tpc tpe tpn tpp tpr tpt tra trc tre trn trp trr trt tta ttc tte ttn ttp ttr ttt