a-a a-c aaa aac aaf aak aan aar ac- aca acc acf ack acn acr af- afa afc aff afk afn afr aka akc akk akn akr an- ana anc anf ank ann anr ar- ara arc arf ark arn arr c-- caa cac caf cak can car cca ccc ccf cck ccn ccr cfa cfc cff cfk cfn cfr cka ckc cn- cna cnc cnf cnn cnr cra crc crf crk crn crr faa fac faf fak fan far fca fcc fcf fck fcn fcr ffa ffc fff ffk ffn ffr fka fkc fkf fkk fna fnc fnf fnk fnn fnr fra frc frf frk frn frr ka- kaa kac kaf kak kan kar kca kcc kck kcn kcr kfa kfc kff kkc kkk kkn kkr kn- kna knc knf knk knn knr kra krc krf krk krn krr naa nac naf nak nan nar nca ncc ncf nck ncn ncr nfa nfc nff nfk nfn nfr nka nkc nkf nkk nkn nkr nna nnc nnf nnk nnn nra nrc nrf nrk nrn nrr ra- raa rac raf rak ran rar rca rcc rcf rcn rcr rfa rfc rff rfk rfn rfr rkc rkf rkk rna rnc rnn rnr rra rrc rrf rrk rrn rrr