This allows {TAIL ~ the image forming apparatuses} to mutually inform the processing statuses prior to {HEAD ~ assignment} of the print data 
This allows { TAIL ~ the image forming apparatuses } to mutually inform the processing statuses prior to { HEAD ~ assignment } of the print data
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH