a-a a-c aaa aac aao aar aas aay ac- aca acc aco acr acs acy aoa aoc aoo aor aos ar- ara arc aro arr ars ary as- asa asc aso asr ass asy ay- aya ayc ayo ayr ays c-- caa cac cao car cas cay cca ccc cco ccr ccs co- coa coc coo cor cos coy cra crc cro crr crs cry csa csc cso csr css csy cya cyc cyo cyr cys oaa oac oao oar oas oc- oca occ oco ocr ocs oo- ooa ooc ooo oor oos or- ora orc oro orr ors ory os- osa osc oso osr oss oya oyo oys ra- raa rac rao rar ras ray rca rcc rco rcr rcs roa roc roo ror ros roy rra rrc rrr rrs rsa rsc rso rsr rss ry- rya ryc ryo ryr rys ryy saa sac sao sar sas say sca scc sco scr scs soa soc soo sor sos soy sr- sra src sro srr srs sry ss- ssa ssc sso ssr sss sy- sya syc syr sys yaa yac yao yar yas yay yca ycc yco ycs ycy yoc yoo yor yos yoy yra yrc yro yrs ysa ysc yso ysr yss ysy yyc yys yyy