c-- ccc cco ccp cct ccz co- coc coo cop cot coy coz cpc cpo cpp cpt cpz ctc cto ctp ctt cty ctz cyc cyo cyp cyt cz- czc czo czt oc- occ oco ocp oct ocz oo- ooc ooo oop oot op- opc opo opp opt opy ot- otc oto otp ott otz oyo ozo ozt ozz p-p pcc pco pcp pct poc poo pop pot poy poz ppc ppo ppp ppt ppz pt- ptc pto ptp ptt pty ptz py- pyc pyo pyt pzc pzp pzt tcc tco tcp tct to- toc too top tot toy toz tpc tpo tpp tpt tpz ttc tto ttp ttt tty tyc tyo typ tyt ycc yco ycp ycy yoc yoo yop yot yoy ypo ytc yto ytp ytt yyc yyt yyy yyz yzy zco zo- zoc zoo zot zpc zpo zpp zpt zzt zzy zzz