query:
	insert | update | delete |
	xid_event | xid_event | xid_event ;

xid_event:
	START TRANSACTION | COMMIT | ROLLBACK |
	CREATE TABLE IF NOT EXISTS _letter SELECT * FROM _table ; TRUNCATE TABLE _letter;

insert:
	INSERT INTO _table ( _field ) VALUES ( digit ) ;

update:
	UPDATE _table SET _field = digit ORDER BY _field LIMIT digit ;

delete:
	DELETE FROM _table WHERE _field < digit LIMIT 1 ;