public function insertMarker() {
		$elt = new Marker( 'marker' );
		if ( $this->tail ) {
			$this->tail->nextAFE = $elt;
			$elt->prevAFE = $this->tail;
		} else {
			$this->head = $elt;
		}
		$this->tail = $elt;
		$this->noahTableStack[] = [];
	}