a-a aaa aag aao aas aax aay ag- aga agg ago ags agx agy aoa aog aoo aos aox as- asa asg aso ass asx asy ax- axa axo axs axx ay- aya ayo ays ayx gaa gag gao gas gay gga ggg ggo ggs goa gog goo gos gox goy gsa gsg gso gss gsx gxa gxs gy- gya gyo gys oaa oag oao oas oax oga ogg ogo ogs ogx ogy oo- ooa oog ooo oos oox os- osa osg oso oss osx ox- oxa oxo oxx oxy oya oyo oys saa sag sao sas sax say sga sgg sgo sgs sgx soa sog soo sos sox soy ss- ssa ssg sso sss ssx sxs sy- sya syg sys syx xaa xag xas xoa xog xoo xos xox xsa xss xxo xxx xxy xyy yaa yag yao yas yax yay yga ygo yog yoo yos yox yoy ysa ysg yso yss ysy yxa yxy yyg yys yyy