Construct the natural cubic spline for the following data

Construct the natural cubic spline for the following data.
a.
x 
f(x) 
0 
1.00000 
0.5 
2.71825 
b.
x 
f(x) 
-0.25 
1.33203 
0.25 
0.800781 
c.
x 
f(x) 
0.1 
-−0.29004996 
0.2 
−0.56079734 
0.3 
−0.81401972 
d.
x 
f(x) 
-1 
0.86199480 
0.5 
0.95802009 
0 
1.0986123 
0.5 
1.2943767 
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