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             roots.i  
 
       defines:  
     nraphson     - Newton-Raphson/bisection root solver (scalar)  
     f_inverse    - function inverse by Newton-Raphson (vectorized)  
     mnbrent      - Brent's method minimizer (scalar)  
     mxbrent      - Brent's method maximizer (scalar)  
keyword,  defined at i/roots.i   line 10  
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