Sheet: 
(0, 0)		click (a)
(0, 1)		Cancel (b)
(0, 2)		Next1 (e)
(1, 0)		TRUE
(1, 1)		FALSE
(1, 2)		FALSE
(2, 0)		TRUE
(2, 1)		TRUE
(2, 2)		TRUE
(3, 0)		TRUE
(3, 1)		FALSE
(4, 0)		TRUE
(4, 1)		TRUE