{HEAD ~ The J shaped end} of the second shield is of {TAIL ~ a complementary configuration} receivable slidably within the first J shaped end 
is of
{ HEAD ~ The J shaped end } of the second shield is of { TAIL ~ a complementary configuration } receivable slidably within the first J shaped end
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH