They will have the same mass, but if they touch they will destroy each other, producing energy in the form of heat and light.
(They; will have; the same mass) (they; touch; ) (they; will destroy; each other) Context(they will destroy,List([48, 65))):(they; will destroy each other producing; energy)
they will destroy,List([48, 65))
They they they they
will have touch will destroy will destroy each other producing
the same mass
each other
energy