In some embodiments {HEAD ~ the reader} may retrieve {TAIL ~ the SAPK} indirectly, via a 3rd party 
retrieve
In some embodiments { HEAD ~ the reader } may retrieve { TAIL ~ the SAPK } indirectly , via a 3rd party
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH