發送短信 : Analysis of alu chip and realizing with pass transistor logic

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 |  _ \\    / _ \\  |  __ \\   |  ___|| \ \\ / // 
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 | .  //   | \_/ || | |__/ ||  | ||__     \  //   
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 `-` --`    `---`    -----`    `-----`      `