{TAIL ~ A dataset} including {HEAD ~ data elements} and order keys for indicating an ordering of the data elements is stored 
{ TAIL ~ A dataset } including { HEAD ~ data elements } and order keys for indicating an ordering of the data elements is stored
TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH