a-a a-c aaa aac aao aar aay ac- aca acc aco acr acy aoa aoc aoo aor ar- ara arc aro arr ary ay- aya ayc ayo ayr c-- caa cac cao car cay cca ccc cco ccr co- coa coc coo cor coy cra crc cro crr cry cya cyc cyo cyr oaa oac oao oar oc- oca occ oco ocr oo- ooa ooc ooo oor or- ora orc oro orr ory oya oyo ra- raa rac rao rar ray rca rcc rco rcr roa roc roo ror roy rra rrc rrr ry- rya ryc ryo ryr ryy yaa yac yao yar yay yca ycc yco ycy yoc yoo yor yoy yra yrc yro yyc yyy