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The two sentences are not mutually exclusive, and mass is, in a
sense, “equivalent” to energy. I'd prefer to use the phrase that
mass is a form of energy, that in this way there is an equivalence
between mass and energy - not the total energy, of course. just as a
hamburger is a form of energy, but not the entire energy.
I think this is word-play, but still important because so many of
these concepts can be confusing.