[
(0,0,"0"),
(null,1,"1"),
(2,null,"2"),
(3,3,null),
(?1,4,"4"),
(5,?1,"5"),
(6,6,?1),
(?2,7,"7"),
(8,?2,"8"),
(9,9,?2),
(10,10,"10"),
(11,11,"11"),
(12,12,"12"),
(13,13,"13"),
(14,14,"14"),
(15,15,"15"),
(16,16,"16"),
(17,17,"17"),
(18,18,"18"),
(19,19,"19")
]
