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pub fn addition(x:i32,y:i32)->i32 { x+y } pub fn substraction(x:i32,y:i32)->i32 { x-y } pub fn multiplication(x:i32,y:i32)->i32 { x*y } pub fn division(x:i32,y:i32)->i32 { x*y } pub fn reminder(x:i32,y:i32)->i32 { x%y }