c-- ccc cch cco ccs ccv ch- chc chh cho chs chv chy co- coc coh coo cos cov coy csc csh cso css csv csy cvc cvh cvo cvs cvv cyc cyo cys hcc hch hco hcs hcv hcy hhc hhh hho hhs hhv hhy hoc hoh hoo hos hov hoy hsc hsh hss hsv hsy hv- hvc hvo hvs hvv hvy hy- hyc hyh hyo hys hyv hyy oc- occ och oco ocs ocv ohc ohh oho ohs oo- ooc ooh ooo oos oov os- osc osh oso oss osv ov- ovc ovh ovo ovs ovv oyo oys scc sch sco scs scv sh- shc shh sho shs shv shy soc soh soo sos sov soy ss- ssc ssh sso sss ssv svc svo svs svv svy sy- syc syh sys vcc vch vco vcs vcy vh- vhc vho vhs voc voh voo vos vov voy vsc vsh vso vss vsv vvc vvo vvs vvv ycc ych yco ycs ycv ycy yhc yhs yoc yoo yos yoy ysc yso yss ysy yvo yvy yyc yys yyy