c-- ccc cco ccp ccs cct co- coc coo cop cos cot coy cpc cpo cpp cps cpt csc cso csp css cst csy ctc cto ctp cts ctt cty cyc cyo cyp cys cyt oc- occ oco ocp ocs oct oo- ooc ooo oop oos oot op- opc opo opp ops opt opy os- osc oso osp oss ost ot- otc oto otp ots ott oyo oys p-p pcc pco pcp pcs pct poc poo pop pos pot poy ppc ppo ppp pps ppt ps- psc pso psp pss pst psy pt- ptc pto ptp pts ptt pty py- pyc pyo pys pyt scc sco scp scs sct soc soo sop sos sot soy spc spo spp sps spt spy ss- ssc sso ssp sss sst stc sto stp sts stt sty sy- syc syp sys syt tcc tco tcp tcs tct to- toc too top tos tot toy tpc tpo tpp tps tpt tsc tso tsp tss tst tsy ttc tto ttp tts ttt tty tyc tyo typ tys tyt ycc yco ycp ycs ycy yoc yoo yop yos yot yoy ypo yps ysc yso ysp yss yst ysy ytc yto ytp yts ytt yyc yys yyt yyy