4.525 * [progress]: [Phase 1 of 3] Setting up.
0.001 * * * [progress]: [1/2] Preparing points
0.034 * * * [progress]: [2/2] Setting up program.
0.037 * [progress]: [Phase 2 of 3] Improving.
0.037 * [simplify]: Simplifying using  #<procedure:simplify-batch-egg> :
   (- (erf (+ x y)) (erf (- x y)))
0.039 * * [simplify]: iteration  0 :  17  enodes  (cost  5 )
0.042 * * [simplify]: iteration  1 :  33  enodes  (cost  5 )
0.043 * * [simplify]: iteration  2 :  74  enodes  (cost  5 )
0.045 * * [simplify]: iteration  3 :  259  enodes  (cost  5 )
0.049 * * [simplify]: iteration  4 :  962  enodes  (cost  5 )
0.066 * * [simplify]: iteration  5 :  2912  enodes  (cost  5 )
0.120 * * [simplify]: iteration  6 :  5001  enodes  (cost  5 )
0.120 * [simplify]: Simplified to:
   (- (erf (+ x y)) (erf (- x y)))
0.120 * [progress]: [Phase 3 of 3] Extracting.
0.123 * [simplify]: Simplifying using  #<procedure:simplify-batch-egg> :
   (- (erf (+ x y)) (erf (- x y)))
0.124 * * [simplify]: iteration  0 :  8  enodes  (cost  5 )
0.124 * * [simplify]: iteration  1 :  8  enodes  (cost  5 )
0.124 * [simplify]: Simplified to:
   (- (erf (+ x y)) (erf (- x y)))
1.269 * [regime-testing]: End program error score: 7.451720384007617