set label "-1" at 1,0 center
set label "1" at 3,0 center
set label "1" at 5,0 center
set label "-1" at 7,0 center
set label "-1" at 9,0 center
set label "-1" at 11,0 center
set label "1" at 13,0 center
set label "1" at 15,0 center
set label "-1" at 17,0 center
set label "1" at 19,0 center
set label "1" at 21,0 center
set label "-1" at 23,0 center
set label "-1" at 25,0 center
set label "-1" at 27,0 center
set label "1" at 29,0 center
set label "1" at 31,0 center
set label "1" at 33,0 center
set label "-1" at 35,0 center
set label "-1" at 37,0 center
set label "1" at 39,0 center
set label "1" at 41,0 center
set label "1" at 43,0 center
set label "-1" at 45,0 center
set label "-1" at 47,0 center
set label "-1" at 49,0 center
set label "1" at 51,0 center
set label "1" at 53,0 center
set label "-1" at 55,0 center
set label "-1" at 57,0 center
set label "-1" at 59,0 center
set label "1" at 61,0 center
set label "1" at 63,0 center
set label "1" at 65,0 center
set label "-1" at 67,0 center
set label "-1" at 69,0 center
set label "1" at 71,0 center
set label "1" at 73,0 center
set label "1" at 75,0 center
set label "-1" at 77,0 center
set label "-1" at 79,0 center
set label "1" at 81,0 center
set label "-1" at 83,0 center
set label "-1" at 85,0 center
set label "1" at 87,0 center
set label "1" at 89,0 center
set label "1" at 91,0 center
set label "-1" at 93,0 center
set label "-1" at 95,0 center
plot '-' with lines lt 1
0 1
0 -1
2 -1
2 1
4 1
4 1
6 1
6 -1
8 -1
8 -1
10 -1
10 -1
12 -1
12 1
14 1
14 1
16 1
16 -1
18 -1
18 1
20 1
20 1
22 1
22 -1
24 -1
24 -1
26 -1
26 -1
28 -1
28 1
30 1
30 1
32 1
32 1
34 1
34 -1
36 -1
36 -1
38 -1
38 1
40 1
40 1
42 1
42 1
44 1
44 -1
46 -1
46 -1
48 -1
48 -1
50 -1
50 1
52 1
52 1
54 1
54 -1
56 -1
56 -1
58 -1
58 -1
60 -1
60 1
62 1
62 1
64 1
64 1
66 1
66 -1
68 -1
68 -1
70 -1
70 1
72 1
72 1
74 1
74 1
76 1
76 -1
78 -1
78 -1
80 -1
80 1
82 1
82 -1
84 -1
84 -1
86 -1
86 1
88 1
88 1
90 1
90 1
92 1
92 -1
94 -1
94 -1
96 -1
96 1
e