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############################# -*- Mode: Soar -*- #############################
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## File            : default/selection-iterative deepening.soar
## Author          : John Laird
## Created on      : January 25, 2007  
## Last Modified On: 25 January, 2007
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## Contents:     Default productions for selection problem space for Soar 8.6 with iterative deepening
##                  !!!! Only works for look-ahead over operators that execute in single cycle - no operator-no-change
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### Changes for Iterative Deepening
###    0. Add count of number of tied operators - necessary to ensure all operators - up to 6
###       and tested before incrementing current-evaluation-depth
###    1. Maintain current depth on evaluation (current-evaluation-depth)
###       A. add operator to initiatilize if none on task state
###       B. add operator to increment if no more evaluations at current level
###    2. Move (current-evaluation-depth - 1) to substate (current-evaluation-depth)
###    5. Terminate search when current-evaluation-depth = 0
###    6. Modify evaluation structure on state so associates depth with evaluation
###