a-a a-c aaa aac aaf aak aan aar aas ac- aca acc acf ack acn acr acs af- afa afc aff afk afn afr afs aka akc akk akn akr aks an- ana anc anf ank ann anr ans ar- ara arc arf ark arn arr ars as- asa asc asf ask asn asr ass c-- caa cac caf cak can car cas cca ccc ccf cck ccn ccr ccs cfa cfc cff cfk cfn cfr cfs cka ckc cks cn- cna cnc cnf cnn cnr cns cra crc crf crk crn crr crs csa csc csf csk csn csr css faa fac faf fak fan far fas fca fcc fcf fck fcn fcr fcs ffa ffc fff ffk ffn ffr ffs fka fkc fkf fkk fna fnc fnf fnk fnn fnr fns fra frc frf frk frn frr frs fsa fsc fsf fsk fsn fsr fss ka- kaa kac kaf kak kan kar kas kca kcc kck kcn kcr kcs kfa kfc kff kfs kkc kkk kkn kkr kks kn- kna knc knf knk knn knr kra krc krf krk krn krr krs ksa ksc ksf ksk ksn ksr kss naa nac naf nak nan nar nas nca ncc ncf nck ncn ncr ncs nfa nfc nff nfk nfn nfr nfs nka nkc nkf nkk nkn nkr nks nna nnc nnf nnk nnn nns nra nrc nrf nrk nrn nrr nrs nsa nsc nsf nsk nsn nsr nss ra- raa rac raf rak ran rar ras rca rcc rcf rcn rcr rcs rfa rfc rff rfk rfn rfr rfs rkc rkf rkk rks rna rnc rnn rnr rns rra rrc rrf rrk rrn rrr rrs rsa rsc rsf rsk rsn rsr rss saa sac saf sak san sar sas sca scc scf sck scn scr scs sfa sfc sff sfk sfn sfr sfs sk- ska skc skf skk skr sks sna snc snf snk snn snr sns sr- sra src srf srk srn srr srs ss- ssa ssc ssf ssk ssn ssr sss