-er a-a a-c a-t aaa aac aae aak aan aap aar aas aat ac- aca acc ace ack acn acp acr acs act aea aec aee aek aen aep aer aes aet aka akc ake akk akn akp akr aks an- ana anc ane ank ann anp anr ans ant ap- apa apc ape apk apn app apr aps apt ar- ara arc are ark arn arp arr ars art as- asa asc ase ask asn asp asr ass ast at- ata atc ate atn atp atr ats att c-- caa cac cae cak can cap car cas cat cca ccc cce cck ccn ccp ccr ccs cct ce- cea cec cee cek cen cep cer ces cet cka ckc cks ckt cn- cna cnc cne cnn cnp cnr cns cnt cpa cpc cpe cpk cpn cpp cpr cps cpt cra crc cre crk crn crp crr crs crt csa csc cse csk csn csp csr css cst cta ctc cte ctk ctn ctp ctr cts ctt eaa eac eae eak ean eap ear eas eat ec- eca ecc ece eck ecn ecr ecs ect eea eec eee eek een eep eer ees eet eka ekc eke ekp ekr eks ekt en- ena enc ene enk enn enp enr ens ent ep- epa epc epe epn epp epr eps ept era erc ere erk ern erp err ers ert es- esa esc ese esk esn esp esr ess est eta etc ete etk etn etp etr ets ett k-t ka- kaa kac kae kak kan kap kar kas kat kca kcc kce kck kcn kcp kcr kcs kct ke- kea kec kee kek ken kep ker kes ket kkc kke kkk kkn kkp kkr kks kkt kn- kna knc kne knk knn knp knr knt kpa kpc kpe kpk kpn kpp kpr kps kpt kra krc krk krn krp krr krs krt ksa ksc kse ksk ksn ksp ksr kss kst kta ktc kte ktk ktn ktp ktr kts ktt naa nac nae nak nan nap nar nas nat nca ncc nce nck ncn ncp ncr ncs nct ne- nea nec nee nek nen nep ner nes net nka nkc nke nkk nkn nkp nkr nks nkt nna nnc nne nnk nnn nnp nns nnt npa npc npe npn npp npr nps npt nra nrc nre nrk nrn nrp nrr nrs nrt nsa nsc nse nsk nsn nsp nsr nss nst nta ntc nte ntk ntn ntp ntr nts ntt p-p paa pac pae pak pan pap par pas pat pca pcc pce pck pcn pcp pcr pcs pct pea pec pee pek pen pep per pes pet pka pkc pke pkn pkp pkr pks pkt pn- pna pnc pne pnk pnn pnp pnr pns pnt ppa ppc ppe ppk ppn ppp ppr pps ppt pra prc pre prk prn prp prr prs prt ps- psa psc pse psk psn psp psr pss pst pt- pta ptc pte ptk ptn ptp ptr pts ptt ra- raa rac rae rak ran rap rar ras rat rca rcc rce rcn rcp rcr rcs rct re- rea rec ree rek ren rep rer res ret rkc rke rkk rkp rks rkt rna rnc rnn rnp rnr rns rnt rpa rpc rpe rpk rpn rpp rpr rps rpt rra rrc rrk rrn rrp rrr rrs rrt rsa rsc rse rsk rsn rsp rsr rss rst rta rtc rte rtk rtn rtp rtr rts rtt saa sac sae sak san sap sar sas sat sca scc sce sck scn scp scr scs sct se- sea sec see sek sen sep ser ses set sk- ska skc ske skk skp skr sks skt sna snc sne snk snn snp snr sns snt spa spc spe spk spn spp spr sps spt sr- sra src sre srk srn srp srr srs srt ss- ssa ssc sse ssk ssn ssp ssr sss sst sta stc ste stk stn stp str sts stt taa tac tae tak tan tap tar tas tat tca tcc tce tck tcn tcp tcr tcs tct te- tea tec tee tek ten tep ter tes tet tka tkc tke tkk tkp tkr tks tkt tna tnc tne tnk tnn tnp tnr tns tnt tpa tpc tpe tpk tpn tpp tpr tps tpt tra trc tre trk trn trp trr trs trt tsa tsc tse tsk tsn tsp tsr tss tst tta ttc tte ttk ttn ttp ttr tts ttt