-er a-a a-c a-t aaa aac aae aak aan aap aar aat ac- aca acc ace ack acn acp acr act aea aec aee aek aen aep aer aet aka akc ake akk akn akp akr an- ana anc ane ank ann anp anr ant ap- apa apc ape apk apn app apr apt ar- ara arc are ark arn arp arr art at- ata atc ate atn atp atr att c-- caa cac cae cak can cap car cat cca ccc cce cck ccn ccp ccr cct ce- cea cec cee cek cen cep cer cet cka ckc ckt cn- cna cnc cne cnn cnp cnr cnt cpa cpc cpe cpk cpn cpp cpr cpt cra crc cre crk crn crp crr crt cta ctc cte ctk ctn ctp ctr ctt eaa eac eae eak ean eap ear eat ec- eca ecc ece eck ecn ecr ect eea eec eee eek een eep eer eet eka ekc eke ekp ekr ekt en- ena enc ene enk enn enp enr ent ep- epa epc epe epn epp epr ept era erc ere erk ern erp err ert eta etc ete etk etn etp etr ett k-t ka- kaa kac kae kak kan kap kar kat kca kcc kce kck kcn kcp kcr kct ke- kea kec kee kek ken kep ker ket kkc kke kkk kkn kkp kkr kkt kn- kna knc kne knk knn knp knr knt kpa kpc kpe kpk kpn kpp kpr kpt kra krc krk krn krp krr krt kta ktc kte ktk ktn ktp ktr ktt naa nac nae nak nan nap nar nat nca ncc nce nck ncn ncp ncr nct ne- nea nec nee nek nen nep ner net nka nkc nke nkk nkn nkp nkr nkt nna nnc nne nnk nnn nnp nnt npa npc npe npn npp npr npt nra nrc nre nrk nrn nrp nrr nrt nta ntc nte ntk ntn ntp ntr ntt p-p paa pac pae pak pan pap par pat pca pcc pce pck pcn pcp pcr pct pea pec pee pek pen pep per pet pka pkc pke pkn pkp pkr pkt pn- pna pnc pne pnk pnn pnp pnr pnt ppa ppc ppe ppk ppn ppp ppr ppt pra prc pre prk prn prp prr prt pt- pta ptc pte ptk ptn ptp ptr ptt ra- raa rac rae rak ran rap rar rat rca rcc rce rcn rcp rcr rct re- rea rec ree rek ren rep rer ret rkc rke rkk rkp rkt rna rnc rnn rnp rnr rnt rpa rpc rpe rpk rpn rpp rpr rpt rra rrc rrk rrn rrp rrr rrt rta rtc rte rtk rtn rtp rtr rtt taa tac tae tak tan tap tar tat tca tcc tce tck tcn tcp tcr tct te- tea tec tee tek ten tep ter tet tka tkc tke tkk tkp tkr tkt tna tnc tne tnk tnn tnp tnr tnt tpa tpc tpe tpk tpn tpp tpr tpt tra trc tre trk trn trp trr trt tta ttc tte ttk ttn ttp ttr ttt