Xquery reduce duplicate nodes in the return result

let $root := element root{}
> return
> 	let $seq :=
> 		for $i in (1, 2)
> 		return $root
> 	return $seq
>
> This will return a sequence .

To reduce the duplicate:

> let $root := element root{}
> return
> 	let $seq :=
> 		for $i in (1, 2)
> 		return $root
> 	return $seq intersect $seq
>