function rollBackRelation( $rollBackAction, $relationId, $firstMeaningId, $relationTypeId, $secondMeaningId, $operation ) {
	if ( shouldRemove( $rollBackAction, $operation ) ) {
		removeRelationWithId( $relationId );
	}
	elseif ( shouldRestore( $rollBackAction, $operation ) ) {
		addRelation( $firstMeaningId, $relationTypeId, $secondMeaningId );
	}
}
	public function remove( $keyPath ) {
		$valueId = $keyPath->peek( 0 )->relationId;
		removeRelationWithId( $valueId );
	}