In example II illustrated by FIGS 6A 6B and 6C 6D, {HEAD ~ subsystem} 410 needs {TAIL ~ write permission}, i.e., an owned copy, from a data line whose home address space is in subsystem 480 but is owned by subsystem 420 
In example II illustrated by FIGS 6A 6B and 6C 6D , { HEAD ~ subsystem } 410 needs { TAIL ~ write permission } , i.e. , an owned copy , from a data line whose home address space is in subsystem 480 but is owned by subsystem 420
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL 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