Prev next in a loop?

I solved it. It was not that hard. Just needed to write down the question here to activate my brain cells.

if ( $page->hasPrev() ) {
    $prev = $page->prev()->url();
} else {
    $prev = $page->parents()->children()->last()->url();
}
if ( $page->hasNext() ) {
    $next = $page->next()->url();
} else {
    $next = $page->parents()->children()->first()->url();
}
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