Have I ever inflicted this one on you before:
OK, if matter and antimatter are mixed you get energy, and rather a lot of it.
Now imagine a hypothetical form of 'matter' that when mixed with regular matter yields nothing, that is, no energy, and both forms of matter cancel out and there is nothing left if the masses are equal.
Now imagine another form of matter that when mixed with antimatter yields nothing.
OK, now mix the first form of hypothetical matter with the second form of hypothetical matter.
What do you get ?
OK, if matter and antimatter are mixed you get energy, and rather a lot of it.
Now imagine a hypothetical form of 'matter' that when mixed with regular matter yields nothing, that is, no energy, and both forms of matter cancel out and there is nothing left if the masses are equal.
Now imagine another form of matter that when mixed with antimatter yields nothing.
OK, now mix the first form of hypothetical matter with the second form of hypothetical matter.
What do you get ?
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