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Question: unknowns contains repeated elements: [1, 0]

Question:unknowns contains repeated elements: [1, 0]

Zeineb 500 Maple 12
solve
February 10 2021
0

Dear all
Using cubic spline interpolation to interpolate a given function I get  
the follwoing error
Warning, solving for expressions other than names or functions is not recommended.
Error, (in solve) list of unknowns contains repeated elements: [1, 0]

and  why the  spline funciton obtained by this code is different to the one given by Maple's built in package.

inter.mw

Thank you for any help 
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