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    bool HeldCheck;
    void OnceOnHeld()
    {
        bool KeyHeld = Input.GetKey("Whatever");


        if (Input.GetKeyDown("Whatever"))
        {
            //On Down Event
        }
        else if (KeyHeld && !HeldCheck)
        {
            HeldCheck = true;
            //Start Held Process
        }
        else if (!KeyHeld && HeldCheck)
        {
            HeldCheck = false;
            //End Held Process
        }
    }