For example, see ๐˜นโด โ€“ ๐˜บโด as (๐˜นยฒ)ยฒ โ€“ (๐˜บยฒ)ยฒ, thus recognizing it as a difference of squares that can be factored as (๐˜นยฒ โ€“ ๐˜บยฒ)(๐˜นยฒ + ๐˜บยฒ).

Standards derived from the same national standard