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true true => a & b expect (a) expect (b) --- theory (a human weighs between 80 and 400 pounds) { $x is a human & $x weighs $y pounds => $y >= 80 & $y <= 400 } $x says (i weigh $y pounds) => $x weighs $y pounds $x says (my weight is $y pounds) => $x weighs $y pounds john is a human john weighs x pounds expect (x >= 80) expect (x <= 400)