public static function sieve($input, $paramPredicate)
{
$x = $input->first();
$cell = new Cell($x, null);
$cell->cdr = function () use($input, $paramPredicate, $x) {
return Cell::sieve($input->rest()->filter(function ($n) use($paramPredicate, $x) {
return $paramPredicate($n, $x);
}), $paramPredicate);
};
return $cell;
}
