c-- ccc cce cch cco ccs ce- cec cee ceh ceo ces ch- chc che chh cho chs co- coc coe coh coo cos csc cse csh cso css ec- ecc ece ech eco ecs eec eee eeo ees ehc ehe ehh eho ehs eo- eoc eoe eoh eoo eos es- esc ese esh eso ess hcc hce hch hco hcs he- hec hee heh heo hes hhc hhe hhh hho hhs hoc hoe hoh hoo hos hsc hse hsh hss oc- occ och oco ocs oec oee oeh oeo oes ohc ohe ohh oho ohs oo- ooc ooh ooo oos os- osc ose osh oso oss scc sce sch sco scs se- sec see seh seo ses sh- shc she shh sho shs soc soe soh soo sos ss- ssc sse ssh sso sss