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mod calculator{
   pub mod sum{
       pub fn add(x:i32 , y:i32) -> i32 {
            x + y
        }
    }
   pub mod subt{
      pub fn sub(x:i32 , y:i32) -> i32 {
            x - y
        }
    }
    pub mod mult{
       pub fn multiply(x:i32 , y:i32) -> i32 {
            x * y
        }
    }
}