Question: Stepwise regression using maple

I have a data with one dependent variable Y say and 32 independent variables say X1,X2,X3,....

Now I need to find the best say, a linear fit with the role playing independent variables only choosen so that I get pvalue less and R^2 and adjusted R^2 more than 90%

Even if possible to write for a nonlinear fit too

How to do such a code

Kind help with your advice

I have my data in Excel sheet which I need to import

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