What is the legal implication when a testator states, 'What I bequeathed to so-and-so is half for so-and-so, or a third'?

Primary text

If a testator declares, 'What I bequeathed to so-and-so is half for so-and-so, or a third,' this statement constitutes a revocation solely concerning the portion designated for the second specified person. The remaining portion of the bequest reverts to the first designated person.