Blurb::
Predict MPP using Two-point Adaptive Nonlinear Approximation in "x-space"
Description::  
This mpp_search option uses an x-space Taylor series approximation at the 
uncertain variable means for the initial MPP prediction, then utilizes the 
Two-point Adaptive Nonlinear Approximation (TANA) outlined in 
[ Xu98 "Xu and Grandhi, 1998"] for all subsequent MPP predictions.
Topics::       reliability_methods	
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