a-a a-c aaa aac aan aao aar aax aay ac- aca acc acn aco acr acx acy an- ana anc ann ano anr anx any aoa aoc aon aoo aor aox ar- ara arc arn aro arr arx ary ax- axa axn axo axr axx ay- aya ayc ayn ayo ayr ayx c-- caa cac can cao car cax cay cca ccc ccn cco ccr ccx cn- cna cnc cnn cno cnr cnx cny co- coa coc con coo cor cox coy cra crc crn cro crr crx cry cxc cxo cxr cxx cya cyc cyn cyo cyr naa nac nan nao nar nax nay nca ncc ncn nco ncr ncx nna nnc nnn nno no- noa noc non noo nor nox noy nra nrc nrn nro nrr nrx nry nxc nya nyc nyn nyo nyx nyy oaa oac oan oao oar oax oc- oca occ ocn oco ocr ocx on- ona onc onn ono onr onx ony oo- ooa ooc oon ooo oor oox or- ora orc orn oro orr orx ory ox- oxa oxc oxn oxo oxx oxy oya oyo ra- raa rac ran rao rar rax ray rca rcc rcn rco rcr rcx rna rnc rnn rno rnr rny roa roc ron roo ror rox roy rra rrc rrn rrr rxr ry- rya ryc ryn ryo ryr ryy xaa xac xan xar xcr xcx xna xnc xno xoa xoc xon xoo xor xox xrc xrx xry xxo xxx xxy xyr xyy yaa yac yan yao yar yax yay yca ycc yco ycy yna ynn yny yoc yon yoo yor yox yoy yra yrc yrn yro yxa yxy yyc yyy