y	x2	d
23	1	1
19.5	1	0
24	2	1
21	2	0
25	3	1
22	3	0
26.5	4	1
23.1	4	0
25	5	0
28	5	1
29.5	6	1
26	6	0
27.5	7	0
31.5	7	1
29	8	0