6.968 * [progress]: [Phase 1 of 3] Setting up.
0.001 * * * [progress]: [1/2] Preparing points
0.026 * * * [progress]: [2/2] Setting up program.
0.028 * [progress]: [Phase 2 of 3] Improving.
0.029 * [simplify]: Simplifying using  #<procedure:simplify-batch-egg> :
   (* (+ x y) (- x y))
0.284 * * [simplify]: iteration  0 :  5504  enodes  (cost  7 )
0.284 * [simplify]: Simplified to:
   (- (* x x) (* y y))
0.287 * * [progress]: iteration 1 / 4
0.287 * * * [progress]: picking best candidate
0.291 * * * * [pick]: Picked  #<alt (λ (x y) (- (* x x) (* y y)))>
0.291 * * * [progress]: localizing error
0.295 * * * [progress]: generating rewritten candidates
0.295 * * * * [progress]: [ 1 / 1 ] rewriting at (2)
0.299 * * * [progress]: generating series expansions
0.299 * * * * [progress]: [ 1 / 1 ] generating series at (2)
0.299 * [approximate]: Taking taylor expansion of (- (pow x 2) (pow y 2)) in (x y) around 0
0.299 * [taylor]: Taking taylor expansion of (- (pow x 2) (pow y 2)) in y
0.299 * [taylor]: Taking taylor expansion of (pow x 2) in y
0.299 * [taylor]: Taking taylor expansion of x in y
0.299 * [taylor]: Taking taylor expansion of (pow y 2) in y
0.299 * [taylor]: Taking taylor expansion of y in y
0.299 * [taylor]: Taking taylor expansion of (- (pow x 2) (pow y 2)) in x
0.299 * [taylor]: Taking taylor expansion of (pow x 2) in x
0.299 * [taylor]: Taking taylor expansion of x in x
0.299 * [taylor]: Taking taylor expansion of (pow y 2) in x
0.299 * [taylor]: Taking taylor expansion of y in x
0.299 * [taylor]: Taking taylor expansion of (- (pow x 2) (pow y 2)) in x
0.299 * [taylor]: Taking taylor expansion of (pow x 2) in x
0.299 * [taylor]: Taking taylor expansion of x in x
0.299 * [taylor]: Taking taylor expansion of (pow y 2) in x
0.299 * [taylor]: Taking taylor expansion of y in x
0.300 * [taylor]: Taking taylor expansion of (neg (pow y 2)) in y
0.300 * [taylor]: Taking taylor expansion of (pow y 2) in y
0.300 * [taylor]: Taking taylor expansion of y in y
0.300 * [taylor]: Taking taylor expansion of 0 in y
0.300 * [taylor]: Taking taylor expansion of 1 in y
0.300 * [taylor]: Taking taylor expansion of 0 in y
0.300 * [taylor]: Taking taylor expansion of 0 in y
0.300 * [approximate]: Taking taylor expansion of (- (/ 1 (pow x 2)) (/ 1 (pow y 2))) in (x y) around 0
0.300 * [taylor]: Taking taylor expansion of (- (/ 1 (pow x 2)) (/ 1 (pow y 2))) in y
0.300 * [taylor]: Taking taylor expansion of (/ 1 (pow x 2)) in y
0.300 * [taylor]: Taking taylor expansion of (pow x 2) in y
0.300 * [taylor]: Taking taylor expansion of x in y
0.301 * [taylor]: Taking taylor expansion of (/ 1 (pow y 2)) in y
0.301 * [taylor]: Taking taylor expansion of (pow y 2) in y
0.301 * [taylor]: Taking taylor expansion of y in y
0.301 * [taylor]: Taking taylor expansion of (- (/ 1 (pow x 2)) (/ 1 (pow y 2))) in x
0.301 * [taylor]: Taking taylor expansion of (/ 1 (pow x 2)) in x
0.301 * [taylor]: Taking taylor expansion of (pow x 2) in x
0.301 * [taylor]: Taking taylor expansion of x in x
0.301 * [taylor]: Taking taylor expansion of (/ 1 (pow y 2)) in x
0.301 * [taylor]: Taking taylor expansion of (pow y 2) in x
0.301 * [taylor]: Taking taylor expansion of y in x
0.301 * [taylor]: Taking taylor expansion of (- (/ 1 (pow x 2)) (/ 1 (pow y 2))) in x
0.301 * [taylor]: Taking taylor expansion of (/ 1 (pow x 2)) in x
0.301 * [taylor]: Taking taylor expansion of (pow x 2) in x
0.301 * [taylor]: Taking taylor expansion of x in x
0.301 * [taylor]: Taking taylor expansion of (/ 1 (pow y 2)) in x
0.301 * [taylor]: Taking taylor expansion of (pow y 2) in x
0.301 * [taylor]: Taking taylor expansion of y in x
0.301 * [taylor]: Taking taylor expansion of 1 in y
0.301 * [taylor]: Taking taylor expansion of 0 in y
0.301 * [taylor]: Taking taylor expansion of (neg (/ 1 (pow y 2))) in y
0.301 * [taylor]: Taking taylor expansion of (/ 1 (pow y 2)) in y
0.301 * [taylor]: Taking taylor expansion of (pow y 2) in y
0.301 * [taylor]: Taking taylor expansion of y in y
0.302 * [taylor]: Taking taylor expansion of 0 in y
0.302 * [taylor]: Taking taylor expansion of 0 in y
0.303 * [approximate]: Taking taylor expansion of (- (/ 1 (pow x 2)) (/ 1 (pow y 2))) in (x y) around 0
0.303 * [taylor]: Taking taylor expansion of (- (/ 1 (pow x 2)) (/ 1 (pow y 2))) in y
0.303 * [taylor]: Taking taylor expansion of (/ 1 (pow x 2)) in y
0.303 * [taylor]: Taking taylor expansion of (pow x 2) in y
0.303 * [taylor]: Taking taylor expansion of x in y
0.303 * [taylor]: Taking taylor expansion of (/ 1 (pow y 2)) in y
0.303 * [taylor]: Taking taylor expansion of (pow y 2) in y
0.303 * [taylor]: Taking taylor expansion of y in y
0.303 * [taylor]: Taking taylor expansion of (- (/ 1 (pow x 2)) (/ 1 (pow y 2))) in x
0.303 * [taylor]: Taking taylor expansion of (/ 1 (pow x 2)) in x
0.303 * [taylor]: Taking taylor expansion of (pow x 2) in x
0.303 * [taylor]: Taking taylor expansion of x in x
0.303 * [taylor]: Taking taylor expansion of (/ 1 (pow y 2)) in x
0.303 * [taylor]: Taking taylor expansion of (pow y 2) in x
0.303 * [taylor]: Taking taylor expansion of y in x
0.303 * [taylor]: Taking taylor expansion of (- (/ 1 (pow x 2)) (/ 1 (pow y 2))) in x
0.303 * [taylor]: Taking taylor expansion of (/ 1 (pow x 2)) in x
0.303 * [taylor]: Taking taylor expansion of (pow x 2) in x
0.303 * [taylor]: Taking taylor expansion of x in x
0.303 * [taylor]: Taking taylor expansion of (/ 1 (pow y 2)) in x
0.303 * [taylor]: Taking taylor expansion of (pow y 2) in x
0.303 * [taylor]: Taking taylor expansion of y in x
0.303 * [taylor]: Taking taylor expansion of 1 in y
0.303 * [taylor]: Taking taylor expansion of 0 in y
0.304 * [taylor]: Taking taylor expansion of (neg (/ 1 (pow y 2))) in y
0.304 * [taylor]: Taking taylor expansion of (/ 1 (pow y 2)) in y
0.304 * [taylor]: Taking taylor expansion of (pow y 2) in y
0.304 * [taylor]: Taking taylor expansion of y in y
0.304 * [taylor]: Taking taylor expansion of 0 in y
0.304 * [taylor]: Taking taylor expansion of 0 in y
0.305 * * * [progress]: simplifying candidates
0.305 * [simplify]: Simplifying using  #<procedure:simplify-batch-egg> :
   (/ (exp (* x x)) (exp (* y y)))
  (log (- (* x x) (* y y)))
  (exp (- (* x x) (* y y)))
  (* (cbrt (- (* x x) (* y y))) (cbrt (- (* x x) (* y y))))
  (cbrt (- (* x x) (* y y)))
  (* (* (- (* x x) (* y y)) (- (* x x) (* y y))) (- (* x x) (* y y)))
  (sqrt (- (* x x) (* y y)))
  (sqrt (- (* x x) (* y y)))
  (- (pow (* x x) 3) (pow (* y y) 3))
  (+ (* (* x x) (* x x)) (+ (* (* y y) (* y y)) (* (* x x) (* y y))))
  (neg (* y y))
  (- (* (* x x) (* x x)) (* (* y y) (* y y)))
  (+ (* x x) (* y y))
  (+ x y)
  (- x y)
  (neg (* y y))
  (- (pow x 2) (pow y 2))
  (- (pow x 2) (pow y 2))
  (- (pow x 2) (pow y 2))
0.326 * * [simplify]: iteration  0 :  5037  enodes  (cost  145 )
0.327 * [simplify]: Simplified to:
   (pow (exp (+ x y)) (- x y))
  (log (- (* x x) (* y y)))
  (pow (exp (+ x y)) (- x y))
  (* (cbrt (- (* x x) (* y y))) (cbrt (- (* x x) (* y y))))
  (cbrt (- (* x x) (* y y)))
  (pow (- (* x x) (* y y)) 3)
  (sqrt (- (* x x) (* y y)))
  (sqrt (- (* x x) (* y y)))
  (- (pow x 6) (pow y 6))
  (+ (pow x 4) (+ (pow y 4) (* x (* x (* y y)))))
  (* y (neg y))
  (- (pow x 4) (pow y 4))
  (+ (* x x) (* y y))
  (+ x y)
  (- x y)
  (* y (neg y))
  (- (* x x) (* y y))
  (- (* x x) (* y y))
  (- (* x x) (* y y))
0.327 * * * [progress]: adding candidates to table
0.347 * * [progress]: iteration 2 / 4
0.347 * * * [progress]: picking best candidate
0.350 * * * * [pick]: Picked  #<alt (λ (x y) (* (+ x y) (- x y)))>
0.350 * * * [progress]: localizing error
0.357 * * * [progress]: generating rewritten candidates
0.358 * * * * [progress]: [ 1 / 1 ] rewriting at (2)
0.373 * * * [progress]: generating series expansions
0.373 * * * * [progress]: [ 1 / 1 ] generating series at (2)
0.373 * [approximate]: Taking taylor expansion of (* (+ x y) (- x y)) in (x y) around 0
0.373 * [taylor]: Taking taylor expansion of (* (+ x y) (- x y)) in y
0.373 * [taylor]: Taking taylor expansion of (+ x y) in y
0.373 * [taylor]: Taking taylor expansion of x in y
0.373 * [taylor]: Taking taylor expansion of y in y
0.373 * [taylor]: Taking taylor expansion of (- x y) in y
0.373 * [taylor]: Taking taylor expansion of x in y
0.373 * [taylor]: Taking taylor expansion of y in y
0.374 * [taylor]: Taking taylor expansion of (* (+ x y) (- x y)) in x
0.374 * [taylor]: Taking taylor expansion of (+ x y) in x
0.374 * [taylor]: Taking taylor expansion of x in x
0.374 * [taylor]: Taking taylor expansion of y in x
0.374 * [taylor]: Taking taylor expansion of (- x y) in x
0.374 * [taylor]: Taking taylor expansion of x in x
0.374 * [taylor]: Taking taylor expansion of y in x
0.374 * [taylor]: Taking taylor expansion of (* (+ x y) (- x y)) in x
0.374 * [taylor]: Taking taylor expansion of (+ x y) in x
0.374 * [taylor]: Taking taylor expansion of x in x
0.374 * [taylor]: Taking taylor expansion of y in x
0.374 * [taylor]: Taking taylor expansion of (- x y) in x
0.374 * [taylor]: Taking taylor expansion of x in x
0.374 * [taylor]: Taking taylor expansion of y in x
0.374 * [taylor]: Taking taylor expansion of (* -1 (pow y 2)) in y
0.374 * [taylor]: Taking taylor expansion of -1 in y
0.374 * [taylor]: Taking taylor expansion of (pow y 2) in y
0.374 * [taylor]: Taking taylor expansion of y in y
0.374 * [taylor]: Taking taylor expansion of 0 in y
0.374 * [taylor]: Taking taylor expansion of 1 in y
0.375 * [taylor]: Taking taylor expansion of 0 in y
0.375 * [taylor]: Taking taylor expansion of 0 in y
0.375 * [approximate]: Taking taylor expansion of (* (- (/ 1 x) (/ 1 y)) (+ (/ 1 y) (/ 1 x))) in (x y) around 0
0.375 * [taylor]: Taking taylor expansion of (* (- (/ 1 x) (/ 1 y)) (+ (/ 1 y) (/ 1 x))) in y
0.375 * [taylor]: Taking taylor expansion of (- (/ 1 x) (/ 1 y)) in y
0.375 * [taylor]: Taking taylor expansion of (/ 1 x) in y
0.375 * [taylor]: Taking taylor expansion of x in y
0.376 * [taylor]: Taking taylor expansion of (/ 1 y) in y
0.376 * [taylor]: Taking taylor expansion of y in y
0.376 * [taylor]: Taking taylor expansion of (+ (/ 1 y) (/ 1 x)) in y
0.376 * [taylor]: Taking taylor expansion of (/ 1 y) in y
0.376 * [taylor]: Taking taylor expansion of y in y
0.376 * [taylor]: Taking taylor expansion of (/ 1 x) in y
0.376 * [taylor]: Taking taylor expansion of x in y
0.376 * [taylor]: Taking taylor expansion of (* (- (/ 1 x) (/ 1 y)) (+ (/ 1 y) (/ 1 x))) in x
0.376 * [taylor]: Taking taylor expansion of (- (/ 1 x) (/ 1 y)) in x
0.376 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.376 * [taylor]: Taking taylor expansion of x in x
0.376 * [taylor]: Taking taylor expansion of (/ 1 y) in x
0.376 * [taylor]: Taking taylor expansion of y in x
0.376 * [taylor]: Taking taylor expansion of (+ (/ 1 y) (/ 1 x)) in x
0.376 * [taylor]: Taking taylor expansion of (/ 1 y) in x
0.376 * [taylor]: Taking taylor expansion of y in x
0.376 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.376 * [taylor]: Taking taylor expansion of x in x
0.376 * [taylor]: Taking taylor expansion of (* (- (/ 1 x) (/ 1 y)) (+ (/ 1 y) (/ 1 x))) in x
0.376 * [taylor]: Taking taylor expansion of (- (/ 1 x) (/ 1 y)) in x
0.376 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.376 * [taylor]: Taking taylor expansion of x in x
0.376 * [taylor]: Taking taylor expansion of (/ 1 y) in x
0.376 * [taylor]: Taking taylor expansion of y in x
0.376 * [taylor]: Taking taylor expansion of (+ (/ 1 y) (/ 1 x)) in x
0.376 * [taylor]: Taking taylor expansion of (/ 1 y) in x
0.376 * [taylor]: Taking taylor expansion of y in x
0.376 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.377 * [taylor]: Taking taylor expansion of x in x
0.377 * [taylor]: Taking taylor expansion of 1 in y
0.377 * [taylor]: Taking taylor expansion of 0 in y
0.377 * [taylor]: Taking taylor expansion of (neg (/ 1 (pow y 2))) in y
0.377 * [taylor]: Taking taylor expansion of (/ 1 (pow y 2)) in y
0.377 * [taylor]: Taking taylor expansion of (pow y 2) in y
0.377 * [taylor]: Taking taylor expansion of y in y
0.378 * [taylor]: Taking taylor expansion of 0 in y
0.378 * [taylor]: Taking taylor expansion of 0 in y
0.378 * [approximate]: Taking taylor expansion of (* -1 (* (+ (/ 1 y) (/ 1 x)) (- (/ 1 y) (/ 1 x)))) in (x y) around 0
0.378 * [taylor]: Taking taylor expansion of (* -1 (* (+ (/ 1 y) (/ 1 x)) (- (/ 1 y) (/ 1 x)))) in y
0.378 * [taylor]: Taking taylor expansion of -1 in y
0.378 * [taylor]: Taking taylor expansion of (* (+ (/ 1 y) (/ 1 x)) (- (/ 1 y) (/ 1 x))) in y
0.378 * [taylor]: Taking taylor expansion of (+ (/ 1 y) (/ 1 x)) in y
0.378 * [taylor]: Taking taylor expansion of (/ 1 y) in y
0.378 * [taylor]: Taking taylor expansion of y in y
0.378 * [taylor]: Taking taylor expansion of (/ 1 x) in y
0.379 * [taylor]: Taking taylor expansion of x in y
0.379 * [taylor]: Taking taylor expansion of (- (/ 1 y) (/ 1 x)) in y
0.379 * [taylor]: Taking taylor expansion of (/ 1 y) in y
0.379 * [taylor]: Taking taylor expansion of y in y
0.379 * [taylor]: Taking taylor expansion of (/ 1 x) in y
0.379 * [taylor]: Taking taylor expansion of x in y
0.379 * [taylor]: Taking taylor expansion of (* -1 (* (+ (/ 1 y) (/ 1 x)) (- (/ 1 y) (/ 1 x)))) in x
0.379 * [taylor]: Taking taylor expansion of -1 in x
0.379 * [taylor]: Taking taylor expansion of (* (+ (/ 1 y) (/ 1 x)) (- (/ 1 y) (/ 1 x))) in x
0.379 * [taylor]: Taking taylor expansion of (+ (/ 1 y) (/ 1 x)) in x
0.379 * [taylor]: Taking taylor expansion of (/ 1 y) in x
0.379 * [taylor]: Taking taylor expansion of y in x
0.379 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.379 * [taylor]: Taking taylor expansion of x in x
0.379 * [taylor]: Taking taylor expansion of (- (/ 1 y) (/ 1 x)) in x
0.379 * [taylor]: Taking taylor expansion of (/ 1 y) in x
0.379 * [taylor]: Taking taylor expansion of y in x
0.379 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.379 * [taylor]: Taking taylor expansion of x in x
0.379 * [taylor]: Taking taylor expansion of (* -1 (* (+ (/ 1 y) (/ 1 x)) (- (/ 1 y) (/ 1 x)))) in x
0.379 * [taylor]: Taking taylor expansion of -1 in x
0.379 * [taylor]: Taking taylor expansion of (* (+ (/ 1 y) (/ 1 x)) (- (/ 1 y) (/ 1 x))) in x
0.379 * [taylor]: Taking taylor expansion of (+ (/ 1 y) (/ 1 x)) in x
0.379 * [taylor]: Taking taylor expansion of (/ 1 y) in x
0.379 * [taylor]: Taking taylor expansion of y in x
0.379 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.379 * [taylor]: Taking taylor expansion of x in x
0.379 * [taylor]: Taking taylor expansion of (- (/ 1 y) (/ 1 x)) in x
0.379 * [taylor]: Taking taylor expansion of (/ 1 y) in x
0.379 * [taylor]: Taking taylor expansion of y in x
0.379 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.379 * [taylor]: Taking taylor expansion of x in x
0.379 * [taylor]: Taking taylor expansion of 1 in y
0.379 * [taylor]: Taking taylor expansion of 0 in y
0.380 * [taylor]: Taking taylor expansion of (neg (/ 1 (pow y 2))) in y
0.380 * [taylor]: Taking taylor expansion of (/ 1 (pow y 2)) in y
0.380 * [taylor]: Taking taylor expansion of (pow y 2) in y
0.380 * [taylor]: Taking taylor expansion of y in y
0.380 * [taylor]: Taking taylor expansion of 0 in y
0.381 * [taylor]: Taking taylor expansion of 0 in y
0.381 * * * [progress]: simplifying candidates
0.382 * [simplify]: Simplifying using  #<procedure:simplify-batch-egg> :
   (* (+ x y) (- x y))
  (+ (log (+ x y)) (log (- x y)))
  (log (* (+ x y) (- x y)))
  (exp (* (+ x y) (- x y)))
  (* (* (* (+ x y) (+ x y)) (+ x y)) (* (* (- x y) (- x y)) (- x y)))
  (* (cbrt (* (+ x y) (- x y))) (cbrt (* (+ x y) (- x y))))
  (cbrt (* (+ x y) (- x y)))
  (* (* (* (+ x y) (- x y)) (* (+ x y) (- x y))) (* (+ x y) (- x y)))
  (sqrt (* (+ x y) (- x y)))
  (sqrt (* (+ x y) (- x y)))
  (* (+ (pow x 3) (pow y 3)) (- (pow x 3) (pow y 3)))
  (* (+ (* x x) (- (* y y) (* x y))) (+ (* x x) (+ (* y y) (* x y))))
  (* (+ (pow x 3) (pow y 3)) (- (* x x) (* y y)))
  (* (+ (* x x) (- (* y y) (* x y))) (+ x y))
  (* (- (* x x) (* y y)) (- (pow x 3) (pow y 3)))
  (* (- x y) (+ (* x x) (+ (* y y) (* x y))))
  (* (- (* x x) (* y y)) (- (* x x) (* y y)))
  (* (- x y) (+ x y))
  (* (sqrt (+ x y)) (sqrt (- x y)))
  (* (sqrt (+ x y)) (sqrt (- x y)))
  (* (+ x y) x)
  (* (+ x y) (neg y))
  (* (+ x y) x)
  (* (+ x y) (neg y))
  (* x (+ x y))
  (* (neg y) (+ x y))
  (* x (+ x y))
  (* (neg y) (+ x y))
  (* (+ x y) (* (cbrt (- x y)) (cbrt (- x y))))
  (* (+ x y) (sqrt (- x y)))
  (* (+ x y) 1)
  (* (+ x y) (+ (sqrt x) (sqrt y)))
  (* (+ x y) 1)
  (* (cbrt (+ x y)) (- x y))
  (* (sqrt (+ x y)) (- x y))
  (* (+ x y) (- x y))
  (* (+ x y) (- x y))
  (* (+ x y) (- (pow x 3) (pow y 3)))
  (* (+ x y) (- (* x x) (* y y)))
  (* (+ (pow x 3) (pow y 3)) (- x y))
  (* (- (* x x) (* y y)) (- x y))
  (- (pow x 2) (pow y 2))
  (- (pow x 2) (pow y 2))
  (- (pow x 2) (pow y 2))
0.435 * * [simplify]: iteration  0 :  4951  enodes  (cost  395 )
0.435 * * [simplify]: iteration  1 :  4951  enodes  (cost  395 )
0.437 * [simplify]: Simplified to:
   (- (* x x) (* y y))
  (log (- (* x x) (* y y)))
  (log (- (* x x) (* y y)))
  (pow (exp (+ x y)) (- x y))
  (pow (- (* x x) (* y y)) 3)
  (* (cbrt (- (* x x) (* y y))) (cbrt (- (* x x) (* y y))))
  (cbrt (- (* x x) (* y y)))
  (pow (- (* x x) (* y y)) 3)
  (sqrt (- (* x x) (* y y)))
  (sqrt (- (* x x) (* y y)))
  (* (+ (pow x 3) (pow y 3)) (- (pow x 3) (pow y 3)))
  (* (+ (* x x) (* y (- y x))) (+ (* x x) (* y (+ x y))))
  (* (+ x y) (* (- x y) (+ (pow x 3) (pow y 3))))
  (* (+ x y) (+ (* x x) (* y (- y x))))
  (* (+ x y) (* (- x y) (- (pow x 3) (pow y 3))))
  (* (- x y) (+ (* x x) (* y (+ x y))))
  (* (+ x y) (* (+ x y) (* (- x y) (- x y))))
  (- (* x x) (* y y))
  (* (sqrt (+ x y)) (sqrt (- x y)))
  (* (sqrt (+ x y)) (sqrt (- x y)))
  (* x (+ x y))
  (* y (- (neg y) x))
  (* x (+ x y))
  (* y (- (neg y) x))
  (* x (+ x y))
  (* y (- (neg y) x))
  (* x (+ x y))
  (* y (- (neg y) x))
  (* (+ x y) (* (cbrt (- x y)) (cbrt (- x y))))
  (* (+ x y) (sqrt (- x y)))
  (+ x y)
  (* (+ x y) (+ (sqrt x) (sqrt y)))
  (+ x y)
  (* (- x y) (cbrt (+ x y)))
  (* (- x y) (sqrt (+ x y)))
  (- (* x x) (* y y))
  (- (* x x) (* y y))
  (* (+ x y) (- (pow x 3) (pow y 3)))
  (* (+ x y) (- (* x x) (* y y)))
  (* (- x y) (+ (pow x 3) (pow y 3)))
  (* (+ x y) (* (- x y) (- x y)))
  (- (* x x) (* y y))
  (- (* x x) (* y y))
  (- (* x x) (* y y))
0.437 * * * [progress]: adding candidates to table
0.489 * [progress]: [Phase 3 of 3] Extracting.
0.489 * * [regime]: Finding splitpoints for: (#<alt (λ (x y) (- (* x x) (* y y)))> #<alt (λ (x y) (* (+ x y) (- x y)))>)
0.489 * * * [regime-changes]: Trying 3 branch expressions: ((* (+ x y) (- x y)) y x)
0.489 * * * * [regimes]: Trying to branch on (* (+ x y) (- x y)) from (#<alt (λ (x y) (- (* x x) (* y y)))> #<alt (λ (x y) (* (+ x y) (- x y)))>)
0.546 * * * * [regimes]: Trying to branch on y from (#<alt (λ (x y) (- (* x x) (* y y)))> #<alt (λ (x y) (* (+ x y) (- x y)))>)
0.599 * * * * [regimes]: Trying to branch on x from (#<alt (λ (x y) (- (* x x) (* y y)))> #<alt (λ (x y) (* (+ x y) (- x y)))>)
0.633 * * * [regime]: Found split indices: #<option (#s(si 0 255))>
0.634 * [simplify]: Simplifying using  #<procedure:simplify-batch-egg> :
   (- (* x x) (* y y))
0.634 * * [simplify]: iteration  0 :  5  enodes  (cost  7 )
0.634 * * [simplify]: iteration  1 :  5  enodes  (cost  7 )
0.634 * [simplify]: Simplified to:
   (- (* x x) (* y y))
1.514 * [regime-testing]: End program error score: 0.007824098324880756