{HEAD ~ A method} and apparatus for determining {TAIL ~ the relative positions} of a first object and a second object  
for determining
{ HEAD ~ A method } and apparatus for determining { TAIL ~ the relative positions } of a first object and a second object
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH