c-- ccc ccd cch cco ccs cdc cdd cdh cdo cds ch- chc chd chh cho chs co- coc cod coh coo cos csc csd csh cso css dcc dcd dco dcs ddc ddd ddh ddo dds dh- dhc dhd dhh dho dhs doc dod doh doo dos dsc dsd dsh dso dss hcc hcd hch hco hcs hdc hdd hdh hdo hds hhc hhd hhh hho hhs hoc hod hoh hoo hos hsc hsd hsh hss oc- occ ocd och oco ocs odc odd odh odo ods ohc ohd ohh oho ohs oo- ooc ood ooh ooo oos os- osc osd osh oso oss scc scd sch sco scs sdc sdd sdh sdo sds sh- shc shd shh sho shs soc sod soh soo sos ss- ssc ssd ssh sso sss