15.249 * [progress]: [Phase 1 of 3] Setting up.
0.001 * * * [progress]: [1/2] Preparing points
0.031 * * * [progress]: [2/2] Setting up program.
0.034 * [progress]: [Phase 2 of 3] Improving.
0.034 * [simplify]: Simplifying using  #<procedure:simplify-batch-regraph> :
   (- (pow x 4.0) (pow y 4.0))
0.035 * * [simplify]: iteration  0 :  6  enodes  (cost  7 )
0.036 * * [simplify]: iteration  1 :  14  enodes  (cost  7 )
0.037 * * [simplify]: iteration  2 :  29  enodes  (cost  7 )
0.042 * * [simplify]: iteration  3 :  69  enodes  (cost  7 )
0.054 * * [simplify]: iteration  4 :  181  enodes  (cost  7 )
0.108 * * [simplify]: iteration  5 :  567  enodes  (cost  7 )
0.442 * * [simplify]: iteration  6 :  2495  enodes  (cost  7 )
1.508 * * [simplify]: iteration  done :  5001  enodes  (cost  7 )
1.509 * [simplify]: Simplified to:
   (- (pow x 4.0) (pow y 4.0))
1.509 * * [progress]: iteration 1 / 4
1.509 * * * [progress]: picking best candidate
1.511 * * * * [pick]: Picked  #<alt (λ (x y) (- (pow x 4.0) (pow y 4.0)))>
1.511 * * * [progress]: localizing error
1.516 * * * [progress]: generating rewritten candidates
1.516 * * * * [progress]: [ 1 / 1 ] rewriting at (2)
1.528 * * * [progress]: generating series expansions
1.528 * * * * [progress]: [ 1 / 1 ] generating series at (2)
1.528 * [approximate]: Taking taylor expansion of (- (pow x 4) (pow y 4)) in (x y) around 0
1.528 * [taylor]: Taking taylor expansion of (- (pow x 4) (pow y 4)) in y
1.529 * [taylor]: Taking taylor expansion of (pow x 4) in y
1.529 * [taylor]: Taking taylor expansion of x in y
1.529 * [taylor]: Taking taylor expansion of (pow y 4) in y
1.529 * [taylor]: Taking taylor expansion of y in y
1.529 * [taylor]: Taking taylor expansion of (- (pow x 4) (pow y 4)) in x
1.529 * [taylor]: Taking taylor expansion of (pow x 4) in x
1.529 * [taylor]: Taking taylor expansion of x in x
1.529 * [taylor]: Taking taylor expansion of (pow y 4) in x
1.529 * [taylor]: Taking taylor expansion of y in x
1.529 * [taylor]: Taking taylor expansion of (- (pow x 4) (pow y 4)) in x
1.529 * [taylor]: Taking taylor expansion of (pow x 4) in x
1.529 * [taylor]: Taking taylor expansion of x in x
1.529 * [taylor]: Taking taylor expansion of (pow y 4) in x
1.529 * [taylor]: Taking taylor expansion of y in x
1.529 * [taylor]: Taking taylor expansion of (- (pow y 4)) in y
1.529 * [taylor]: Taking taylor expansion of (pow y 4) in y
1.529 * [taylor]: Taking taylor expansion of y in y
1.530 * [taylor]: Taking taylor expansion of 0 in y
1.531 * [taylor]: Taking taylor expansion of 0 in y
1.533 * [taylor]: Taking taylor expansion of 0 in y
1.533 * [approximate]: Taking taylor expansion of (- (/ 1 (pow x 4)) (/ 1 (pow y 4))) in (x y) around 0
1.533 * [taylor]: Taking taylor expansion of (- (/ 1 (pow x 4)) (/ 1 (pow y 4))) in y
1.533 * [taylor]: Taking taylor expansion of (/ 1 (pow x 4)) in y
1.533 * [taylor]: Taking taylor expansion of (pow x 4) in y
1.533 * [taylor]: Taking taylor expansion of x in y
1.534 * [taylor]: Taking taylor expansion of (/ 1 (pow y 4)) in y
1.534 * [taylor]: Taking taylor expansion of (pow y 4) in y
1.534 * [taylor]: Taking taylor expansion of y in y
1.534 * [taylor]: Taking taylor expansion of (- (/ 1 (pow x 4)) (/ 1 (pow y 4))) in x
1.534 * [taylor]: Taking taylor expansion of (/ 1 (pow x 4)) in x
1.534 * [taylor]: Taking taylor expansion of (pow x 4) in x
1.534 * [taylor]: Taking taylor expansion of x in x
1.535 * [taylor]: Taking taylor expansion of (/ 1 (pow y 4)) in x
1.535 * [taylor]: Taking taylor expansion of (pow y 4) in x
1.535 * [taylor]: Taking taylor expansion of y in x
1.535 * [taylor]: Taking taylor expansion of (- (/ 1 (pow x 4)) (/ 1 (pow y 4))) in x
1.535 * [taylor]: Taking taylor expansion of (/ 1 (pow x 4)) in x
1.535 * [taylor]: Taking taylor expansion of (pow x 4) in x
1.535 * [taylor]: Taking taylor expansion of x in x
1.536 * [taylor]: Taking taylor expansion of (/ 1 (pow y 4)) in x
1.536 * [taylor]: Taking taylor expansion of (pow y 4) in x
1.536 * [taylor]: Taking taylor expansion of y in x
1.537 * [taylor]: Taking taylor expansion of 1 in y
1.538 * [taylor]: Taking taylor expansion of 0 in y
1.540 * [taylor]: Taking taylor expansion of 0 in y
1.542 * [taylor]: Taking taylor expansion of 0 in y
1.544 * [taylor]: Taking taylor expansion of (- (/ 1 (pow y 4))) in y
1.544 * [taylor]: Taking taylor expansion of (/ 1 (pow y 4)) in y
1.544 * [taylor]: Taking taylor expansion of (pow y 4) in y
1.544 * [taylor]: Taking taylor expansion of y in y
1.548 * [taylor]: Taking taylor expansion of 0 in y
1.552 * [taylor]: Taking taylor expansion of 0 in y
1.555 * [approximate]: Taking taylor expansion of (- (/ 1 (pow x 4)) (/ 1 (pow y 4))) in (x y) around 0
1.555 * [taylor]: Taking taylor expansion of (- (/ 1 (pow x 4)) (/ 1 (pow y 4))) in y
1.555 * [taylor]: Taking taylor expansion of (/ 1 (pow x 4)) in y
1.555 * [taylor]: Taking taylor expansion of (pow x 4) in y
1.555 * [taylor]: Taking taylor expansion of x in y
1.555 * [taylor]: Taking taylor expansion of (/ 1 (pow y 4)) in y
1.555 * [taylor]: Taking taylor expansion of (pow y 4) in y
1.555 * [taylor]: Taking taylor expansion of y in y
1.556 * [taylor]: Taking taylor expansion of (- (/ 1 (pow x 4)) (/ 1 (pow y 4))) in x
1.556 * [taylor]: Taking taylor expansion of (/ 1 (pow x 4)) in x
1.556 * [taylor]: Taking taylor expansion of (pow x 4) in x
1.556 * [taylor]: Taking taylor expansion of x in x
1.556 * [taylor]: Taking taylor expansion of (/ 1 (pow y 4)) in x
1.557 * [taylor]: Taking taylor expansion of (pow y 4) in x
1.557 * [taylor]: Taking taylor expansion of y in x
1.557 * [taylor]: Taking taylor expansion of (- (/ 1 (pow x 4)) (/ 1 (pow y 4))) in x
1.557 * [taylor]: Taking taylor expansion of (/ 1 (pow x 4)) in x
1.557 * [taylor]: Taking taylor expansion of (pow x 4) in x
1.557 * [taylor]: Taking taylor expansion of x in x
1.558 * [taylor]: Taking taylor expansion of (/ 1 (pow y 4)) in x
1.558 * [taylor]: Taking taylor expansion of (pow y 4) in x
1.558 * [taylor]: Taking taylor expansion of y in x
1.558 * [taylor]: Taking taylor expansion of 1 in y
1.563 * [taylor]: Taking taylor expansion of 0 in y
1.564 * [taylor]: Taking taylor expansion of 0 in y
1.566 * [taylor]: Taking taylor expansion of 0 in y
1.568 * [taylor]: Taking taylor expansion of (- (/ 1 (pow y 4))) in y
1.568 * [taylor]: Taking taylor expansion of (/ 1 (pow y 4)) in y
1.568 * [taylor]: Taking taylor expansion of (pow y 4) in y
1.568 * [taylor]: Taking taylor expansion of y in y
1.572 * [taylor]: Taking taylor expansion of 0 in y
1.577 * [taylor]: Taking taylor expansion of 0 in y
1.579 * * * [progress]: simplifying candidates
1.580 * [simplify]: Simplifying using  #<procedure:simplify-batch-regraph> :
   (/ (exp (pow x 4.0)) (exp (pow y 4.0)))
  (log (- (pow x 4.0) (pow y 4.0)))
  (exp (- (pow x 4.0) (pow y 4.0)))
  (* (cbrt (- (pow x 4.0) (pow y 4.0))) (cbrt (- (pow x 4.0) (pow y 4.0))))
  (cbrt (- (pow x 4.0) (pow y 4.0)))
  (* (* (- (pow x 4.0) (pow y 4.0)) (- (pow x 4.0) (pow y 4.0))) (- (pow x 4.0) (pow y 4.0)))
  (sqrt (- (pow x 4.0) (pow y 4.0)))
  (sqrt (- (pow x 4.0) (pow y 4.0)))
  (- (pow (pow x 4.0) 3) (pow (pow y 4.0) 3))
  (+ (* (pow x 4.0) (pow x 4.0)) (+ (* (pow y 4.0) (pow y 4.0)) (* (pow x 4.0) (pow y 4.0))))
  (- (pow y 4.0))
  (- (* (pow x 4.0) (pow x 4.0)) (* (pow y 4.0) (pow y 4.0)))
  (+ (pow x 4.0) (pow y 4.0))
  (+ (pow (sqrt x) 4.0) (pow (sqrt y) 4.0))
  (- (pow (sqrt x) 4.0) (pow (sqrt y) 4.0))
  (+ (pow (sqrt x) 4.0) (sqrt (pow y 4.0)))
  (- (pow (sqrt x) 4.0) (sqrt (pow y 4.0)))
  (+ (pow (sqrt x) 4.0) (pow y (/ 4.0 2)))
  (- (pow (sqrt x) 4.0) (pow y (/ 4.0 2)))
  (+ (sqrt (pow x 4.0)) (pow (sqrt y) 4.0))
  (- (sqrt (pow x 4.0)) (pow (sqrt y) 4.0))
  (+ (sqrt (pow x 4.0)) (sqrt (pow y 4.0)))
  (- (sqrt (pow x 4.0)) (sqrt (pow y 4.0)))
  (+ (sqrt (pow x 4.0)) (pow y (/ 4.0 2)))
  (- (sqrt (pow x 4.0)) (pow y (/ 4.0 2)))
  (+ (pow x (/ 4.0 2)) (pow (sqrt y) 4.0))
  (- (pow x (/ 4.0 2)) (pow (sqrt y) 4.0))
  (+ (pow x (/ 4.0 2)) (sqrt (pow y 4.0)))
  (- (pow x (/ 4.0 2)) (sqrt (pow y 4.0)))
  (+ (pow x (/ 4.0 2)) (pow y (/ 4.0 2)))
  (- (pow x (/ 4.0 2)) (pow y (/ 4.0 2)))
  (- (pow x 4.0) (pow y 4.0))
  (- (pow x 4.0) (pow y 4.0))
  (- (pow y 4.0))
  0
  (- (pow x 4) (pow y 4))
  (- (pow x 4) (pow y 4))
1.582 * * [simplify]: iteration  0 :  61  enodes  (cost  356 )
1.590 * * [simplify]: iteration  1 :  127  enodes  (cost  345 )
1.610 * * [simplify]: iteration  2 :  304  enodes  (cost  331 )
1.690 * * [simplify]: iteration  3 :  953  enodes  (cost  331 )
2.274 * * [simplify]: iteration  4 :  4380  enodes  (cost  331 )
3.983 * * [simplify]: iteration  done :  5000  enodes  (cost  331 )
3.983 * [simplify]: Simplified to:
   (exp (- (pow x 4.0) (pow y 4.0)))
  (log (- (pow x 4.0) (pow y 4.0)))
  (exp (- (pow x 4.0) (pow y 4.0)))
  (* (cbrt (- (pow x 4.0) (pow y 4.0))) (cbrt (- (pow x 4.0) (pow y 4.0))))
  (cbrt (- (pow x 4.0) (pow y 4.0)))
  (pow (- (pow x 4.0) (pow y 4.0)) 3)
  (sqrt (- (pow x 4.0) (pow y 4.0)))
  (sqrt (- (pow x 4.0) (pow y 4.0)))
  (- (pow (pow x 4.0) 3) (pow (pow y 4.0) 3))
  (+ (pow x (* 2 4.0)) (* (pow y 4.0) (+ (pow x 4.0) (pow y 4.0))))
  (- (pow y 4.0))
  (- (pow x (* 2 4.0)) (pow y (* 2 4.0)))
  (+ (pow x 4.0) (pow y 4.0))
  (+ (pow (sqrt x) 4.0) (pow (sqrt y) 4.0))
  (- (pow (sqrt x) 4.0) (pow (sqrt y) 4.0))
  (+ (pow (sqrt x) 4.0) (sqrt (pow y 4.0)))
  (- (pow (sqrt x) 4.0) (sqrt (pow y 4.0)))
  (+ (pow (sqrt x) 4.0) (pow y (/ 4.0 2)))
  (- (pow (sqrt x) 4.0) (pow y (/ 4.0 2)))
  (+ (sqrt (pow x 4.0)) (pow (sqrt y) 4.0))
  (- (sqrt (pow x 4.0)) (pow (sqrt y) 4.0))
  (+ (sqrt (pow x 4.0)) (sqrt (pow y 4.0)))
  (- (sqrt (pow x 4.0)) (sqrt (pow y 4.0)))
  (+ (sqrt (pow x 4.0)) (pow y (/ 4.0 2)))
  (- (sqrt (pow x 4.0)) (pow y (/ 4.0 2)))
  (+ (pow x (/ 4.0 2)) (pow (sqrt y) 4.0))
  (- (pow x (/ 4.0 2)) (pow (sqrt y) 4.0))
  (+ (pow x (/ 4.0 2)) (sqrt (pow y 4.0)))
  (- (pow x (/ 4.0 2)) (sqrt (pow y 4.0)))
  (+ (pow x (/ 4.0 2)) (pow y (/ 4.0 2)))
  (- (pow x (/ 4.0 2)) (pow y (/ 4.0 2)))
  (- (pow x 4.0) (pow y 4.0))
  (- (pow x 4.0) (pow y 4.0))
  (- (pow y 4.0))
  0
  (- (pow x 4) (pow y 4))
  (- (pow x 4) (pow y 4))
3.983 * * * [progress]: adding candidates to table
4.044 * [progress]: [Phase 3 of 3] Extracting.
4.046 * [simplify]: Simplifying using  #<procedure:simplify-batch-regraph> :
   (- (pow x 4.0) (pow y 4.0))
4.047 * * [simplify]: iteration  0 :  6  enodes  (cost  7 )
4.047 * * [simplify]: iteration  done :  6  enodes  (cost  7 )
4.047 * [simplify]: Simplified to:
   (- (pow x 4.0) (pow y 4.0))
5.037 * [regime-testing]: End program error score: 0.002932795551773634