a-a a-c aaa aac aaf aar aay ac- aca acc acf acr acy af- afa afc aff afr afy ar- ara arc arf arr ary ay- aya ayc ayf ayr c-- caa cac caf car cay cca ccc ccf ccr cfa cfc cff cfr cra crc crf crr cry cya cyc cyf cyr faa fac faf far fay fca fcc fcf fcr fcy ffa ffc fff ffr ffy fra frc frf frr fry fy- fya fyc ra- raa rac raf rar ray rca rcc rcf rcr rfa rfc rff rfr rra rrc rrf rrr ry- rya ryc ryf ryr ryy yaa yac yaf yar yay yca ycc ycf ycy yfa yfc yff yfr yra yrc yrf yyc yyf yyy