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"Psst ... Susie! What's 12 + 7? A billion. Thanks! Wait a minute. That can't be right ... that's what she said 3+4 was. While taking a test, Calvin asks Susie what 12 + 7 is. Susie tells him a billion. Calvin realizes that can't be right, since that's what Susie said 3 + 4 was."