cccc cccp cccs ccoc ccpp ccps ccsp ccss coco cocp coop coos copo copp cops copy cosc coso cosp coss cosy coyo coys cpcs cpos cpps cpsc cpso cscc csco cscs csos cspc csps csys cyc- cycc cycs cypc cyps cyy- cyyc occc ocos ocpp ocys oooo ooos oops opo- opos oppo opps oppy opsy oscc osco osoo osos osso ossy osyp oyss pccc pccs pcos pcpp pcps pcso poco pocs poop poos pop- popc popo popp pops popy poso poss posy poyo poys ppcc ppcs ppos pppo pppp ppps ppss psco psoc psos pspp psps pssc psso psy- psys pyo- pyos pypy pyss s-os sccc sccp sccs sccy scoo scop scpo scps scsc scso soco socs socy soop soos sooy sopo sopp sops sopy soso soss soyo soys spcc spco spcs spoc spoo spop spos spoy spps spso spsp spss spy- spys sscc sscp sscs ssoc ssop sspc sspo ssps sssc ssss syco sypo syso syss yccc yoop yopo yopy yoso yoyo ypcc ysco ysop yyyy