In the sheet set description, the name of {HEAD ~ a sheet set} and information of the sheet attribute description included in {TAIL ~ the sheet set} are stored 
In the sheet set description , the name of { HEAD ~ a sheet set } and information of the sheet attribute description included in { TAIL ~ the sheet set } are stored
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH