{HEAD ~ These operations} include identifying {TAIL ~ a source data structure} and a source attribute associated with the source data structure and identifying a destination data structure and a destination attribute associated with the destination data structure 
{ HEAD ~ These operations } include identifying { TAIL ~ a source data structure } and a source attribute associated with the source data structure and identifying a destination data structure and a destination attribute associated with the destination data structure
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH