Once you learn the secret

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MS Calculator (Android Only) | David J. Greene - (Download) Lewis Once you learn the secretThe Magic Square is an arrangement of numbers on a 4x4 grid where all of the numbers in each row, each column, and the even the diagonals all add up to the same number chosen by the audience. But is it mental magic, or a feat of mathematics? That depends on the performer's presentation, and the ability to perform some simple calculations, all while concentrating on impressing the audience. This is where MS Calculator comes in. Disguised as an Android