a-a aaa aag aao aar aax aay ag- aga agg ago agr agx agy aoa aog aoo aor aox ar- ara arg aro arr arx ary ax- axa axo axr axx ay- aya ayo ayr ayx gaa gag gao gar gay gga ggg ggo ggr goa gog goo gor gox goy gra grg gro grr grx gry gxa gy- gya gyo gyr oaa oag oao oar oax oga ogg ogo ogx ogy oo- ooa oog ooo oor oox or- ora org oro orr orx ory ox- oxa oxo oxx oxy oya oyo ra- raa rag rao rar rax ray rga rgg rgo rgr rgx roa rog roo ror rox roy rra rrg rrr rxr ry- rya ryg ryo ryr ryy xaa xag xar xoa xog xoo xor xox xrx xry xxo xxx xxy xyr xyy yaa yag yao yar yax yay yga ygo yog yoo yor yox yoy yra yrg yro yxa yxy yyg yyy