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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
}