c-- ccc ccn cco ccr ccx cn- cnc cnn cno cnr cnx cny co- coc con coo cor cox coy crc crn cro crr crx cry cxc cxo cxr cxx cyc cyn cyo cyr ncc ncn nco ncr ncx nnc nnn nno no- noc non noo nor nox noy nrc nrn nro nrr nrx nry nxc nyc nyn nyo nyx nyy oc- occ ocn oco ocr ocx on- onc onn ono onr onx ony oo- ooc oon ooo oor oox or- orc orn oro orr orx ory ox- oxc oxn oxo oxx oxy oyo rcc rcn rco rcr rcx rnc rnn rno rnr rny roc ron roo ror rox roy rrc rrn rrr rxr ry- ryc ryn ryo ryr ryy xcr xcx xnc xno xoc xon xoo xor xox xrc xrx xry xxo xxx xxy xyr xyy ycc yco ycy ynn yny yoc yon yoo yor yox yoy yrc yrn yro yxy yyc yyy