0.195 * [progress]: [Phase 1 of 3] Setting up.
0.001 * * * [progress]: [1/2] Preparing points
0.063 * * * [progress]: [2/2] Setting up program.
0.065 * [progress]: [Phase 2 of 3] Improving.
0.066 * [simplify]: Simplifying using  #<procedure:simplify-batch-regraph> :
   (- (log (+ 1.0 (exp x))) (* x y))
0.067 * * [simplify]: iteration  0 :  8  enodes  (cost  9 )
0.068 * * [simplify]: iteration  1 :  12  enodes  (cost  9 )
0.069 * * [simplify]: iteration  2 :  19  enodes  (cost  9 )
0.071 * * [simplify]: iteration  3 :  23  enodes  (cost  9 )
0.073 * * [simplify]: iteration  done :  23  enodes  (cost  9 )
0.073 * [simplify]: Simplified to:
   (- (log (+ 1.0 (exp x))) (* x y))
0.074 * * [progress]: iteration 1 / 4
0.074 * * * [progress]: picking best candidate
0.076 * * * * [pick]: Picked  #<alt (λ (x y) (- (log (+ 1.0 (exp x))) (* x y)))>
0.076 * * * [progress]: localizing error
0.084 * * * [progress]: generating rewritten candidates
0.084 * * * * [progress]: [ 1 / 3 ] rewriting at (2 1)
0.087 * * * * [progress]: [ 2 / 3 ] rewriting at (2 1 1)
0.090 * * * * [progress]: [ 3 / 3 ] rewriting at (2)
0.097 * * * [progress]: generating series expansions
0.097 * * * * [progress]: [ 1 / 3 ] generating series at (2 1)
0.097 * [approximate]: Taking taylor expansion of (log (+ (exp x) 1.0)) in (x) around 0
0.097 * [taylor]: Taking taylor expansion of (log (+ (exp x) 1.0)) in x
0.097 * [taylor]: Taking taylor expansion of (+ (exp x) 1.0) in x
0.097 * [taylor]: Taking taylor expansion of (exp x) in x
0.097 * [taylor]: Taking taylor expansion of x in x
0.097 * [taylor]: Taking taylor expansion of 1.0 in x
0.098 * [taylor]: Taking taylor expansion of (log (+ (exp x) 1.0)) in x
0.098 * [taylor]: Taking taylor expansion of (+ (exp x) 1.0) in x
0.098 * [taylor]: Taking taylor expansion of (exp x) in x
0.098 * [taylor]: Taking taylor expansion of x in x
0.098 * [taylor]: Taking taylor expansion of 1.0 in x
0.115 * [approximate]: Taking taylor expansion of (log (+ (exp (/ 1 x)) 1.0)) in (x) around 0
0.115 * [taylor]: Taking taylor expansion of (log (+ (exp (/ 1 x)) 1.0)) in x
0.115 * [taylor]: Taking taylor expansion of (+ (exp (/ 1 x)) 1.0) in x
0.115 * [taylor]: Taking taylor expansion of (exp (/ 1 x)) in x
0.115 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.115 * [taylor]: Taking taylor expansion of x in x
0.115 * [taylor]: Taking taylor expansion of 1.0 in x
0.116 * [taylor]: Taking taylor expansion of (log (+ (exp (/ 1 x)) 1.0)) in x
0.116 * [taylor]: Taking taylor expansion of (+ (exp (/ 1 x)) 1.0) in x
0.116 * [taylor]: Taking taylor expansion of (exp (/ 1 x)) in x
0.116 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.116 * [taylor]: Taking taylor expansion of x in x
0.116 * [taylor]: Taking taylor expansion of 1.0 in x
0.141 * [approximate]: Taking taylor expansion of (log (+ (exp (/ -1 x)) 1.0)) in (x) around 0
0.141 * [taylor]: Taking taylor expansion of (log (+ (exp (/ -1 x)) 1.0)) in x
0.141 * [taylor]: Taking taylor expansion of (+ (exp (/ -1 x)) 1.0) in x
0.141 * [taylor]: Taking taylor expansion of (exp (/ -1 x)) in x
0.141 * [taylor]: Taking taylor expansion of (/ -1 x) in x
0.141 * [taylor]: Taking taylor expansion of -1 in x
0.141 * [taylor]: Taking taylor expansion of x in x
0.142 * [taylor]: Taking taylor expansion of 1.0 in x
0.142 * [taylor]: Taking taylor expansion of (log (+ (exp (/ -1 x)) 1.0)) in x
0.142 * [taylor]: Taking taylor expansion of (+ (exp (/ -1 x)) 1.0) in x
0.142 * [taylor]: Taking taylor expansion of (exp (/ -1 x)) in x
0.142 * [taylor]: Taking taylor expansion of (/ -1 x) in x
0.142 * [taylor]: Taking taylor expansion of -1 in x
0.142 * [taylor]: Taking taylor expansion of x in x
0.142 * [taylor]: Taking taylor expansion of 1.0 in x
0.162 * * * * [progress]: [ 2 / 3 ] generating series at (2 1 1)
0.162 * [approximate]: Taking taylor expansion of (+ (exp x) 1.0) in (x) around 0
0.162 * [taylor]: Taking taylor expansion of (+ (exp x) 1.0) in x
0.162 * [taylor]: Taking taylor expansion of (exp x) in x
0.162 * [taylor]: Taking taylor expansion of x in x
0.162 * [taylor]: Taking taylor expansion of 1.0 in x
0.162 * [taylor]: Taking taylor expansion of (+ (exp x) 1.0) in x
0.162 * [taylor]: Taking taylor expansion of (exp x) in x
0.162 * [taylor]: Taking taylor expansion of x in x
0.162 * [taylor]: Taking taylor expansion of 1.0 in x
0.165 * [approximate]: Taking taylor expansion of (+ (exp (/ 1 x)) 1.0) in (x) around 0
0.165 * [taylor]: Taking taylor expansion of (+ (exp (/ 1 x)) 1.0) in x
0.165 * [taylor]: Taking taylor expansion of (exp (/ 1 x)) in x
0.165 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.165 * [taylor]: Taking taylor expansion of x in x
0.165 * [taylor]: Taking taylor expansion of 1.0 in x
0.165 * [taylor]: Taking taylor expansion of (+ (exp (/ 1 x)) 1.0) in x
0.165 * [taylor]: Taking taylor expansion of (exp (/ 1 x)) in x
0.165 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.165 * [taylor]: Taking taylor expansion of x in x
0.166 * [taylor]: Taking taylor expansion of 1.0 in x
0.167 * [approximate]: Taking taylor expansion of (+ (exp (/ -1 x)) 1.0) in (x) around 0
0.167 * [taylor]: Taking taylor expansion of (+ (exp (/ -1 x)) 1.0) in x
0.167 * [taylor]: Taking taylor expansion of (exp (/ -1 x)) in x
0.167 * [taylor]: Taking taylor expansion of (/ -1 x) in x
0.167 * [taylor]: Taking taylor expansion of -1 in x
0.167 * [taylor]: Taking taylor expansion of x in x
0.168 * [taylor]: Taking taylor expansion of 1.0 in x
0.168 * [taylor]: Taking taylor expansion of (+ (exp (/ -1 x)) 1.0) in x
0.168 * [taylor]: Taking taylor expansion of (exp (/ -1 x)) in x
0.168 * [taylor]: Taking taylor expansion of (/ -1 x) in x
0.168 * [taylor]: Taking taylor expansion of -1 in x
0.168 * [taylor]: Taking taylor expansion of x in x
0.168 * [taylor]: Taking taylor expansion of 1.0 in x
0.170 * * * * [progress]: [ 3 / 3 ] generating series at (2)
0.170 * [approximate]: Taking taylor expansion of (- (log (+ (exp x) 1.0)) (* x y)) in (x y) around 0
0.170 * [taylor]: Taking taylor expansion of (- (log (+ (exp x) 1.0)) (* x y)) in y
0.170 * [taylor]: Taking taylor expansion of (log (+ (exp x) 1.0)) in y
0.170 * [taylor]: Taking taylor expansion of (+ (exp x) 1.0) in y
0.170 * [taylor]: Taking taylor expansion of (exp x) in y
0.170 * [taylor]: Taking taylor expansion of x in y
0.170 * [taylor]: Taking taylor expansion of 1.0 in y
0.170 * [taylor]: Taking taylor expansion of (* x y) in y
0.170 * [taylor]: Taking taylor expansion of x in y
0.170 * [taylor]: Taking taylor expansion of y in y
0.170 * [taylor]: Taking taylor expansion of (- (log (+ (exp x) 1.0)) (* x y)) in x
0.170 * [taylor]: Taking taylor expansion of (log (+ (exp x) 1.0)) in x
0.170 * [taylor]: Taking taylor expansion of (+ (exp x) 1.0) in x
0.170 * [taylor]: Taking taylor expansion of (exp x) in x
0.170 * [taylor]: Taking taylor expansion of x in x
0.170 * [taylor]: Taking taylor expansion of 1.0 in x
0.171 * [taylor]: Taking taylor expansion of (* x y) in x
0.171 * [taylor]: Taking taylor expansion of x in x
0.171 * [taylor]: Taking taylor expansion of y in x
0.171 * [taylor]: Taking taylor expansion of (- (log (+ (exp x) 1.0)) (* x y)) in x
0.171 * [taylor]: Taking taylor expansion of (log (+ (exp x) 1.0)) in x
0.171 * [taylor]: Taking taylor expansion of (+ (exp x) 1.0) in x
0.171 * [taylor]: Taking taylor expansion of (exp x) in x
0.171 * [taylor]: Taking taylor expansion of x in x
0.171 * [taylor]: Taking taylor expansion of 1.0 in x
0.172 * [taylor]: Taking taylor expansion of (* x y) in x
0.172 * [taylor]: Taking taylor expansion of x in x
0.172 * [taylor]: Taking taylor expansion of y in x
0.173 * [taylor]: Taking taylor expansion of (log 2.0) in y
0.173 * [taylor]: Taking taylor expansion of 2.0 in y
0.177 * [taylor]: Taking taylor expansion of (- 0.5 y) in y
0.178 * [taylor]: Taking taylor expansion of 0.5 in y
0.178 * [taylor]: Taking taylor expansion of y in y
0.190 * [taylor]: Taking taylor expansion of (- 0.25 (* 1/2 (/ 1 (pow 2.0 2)))) in y
0.190 * [taylor]: Taking taylor expansion of 0.25 in y
0.190 * [taylor]: Taking taylor expansion of (* 1/2 (/ 1 (pow 2.0 2))) in y
0.190 * [taylor]: Taking taylor expansion of 1/2 in y
0.190 * [taylor]: Taking taylor expansion of (/ 1 (pow 2.0 2)) in y
0.190 * [taylor]: Taking taylor expansion of (pow 2.0 2) in y
0.190 * [taylor]: Taking taylor expansion of 2.0 in y
0.192 * [approximate]: Taking taylor expansion of (- (log (+ (exp (/ 1 x)) 1.0)) (/ 1 (* x y))) in (x y) around 0
0.192 * [taylor]: Taking taylor expansion of (- (log (+ (exp (/ 1 x)) 1.0)) (/ 1 (* x y))) in y
0.192 * [taylor]: Taking taylor expansion of (log (+ (exp (/ 1 x)) 1.0)) in y
0.192 * [taylor]: Taking taylor expansion of (+ (exp (/ 1 x)) 1.0) in y
0.192 * [taylor]: Taking taylor expansion of (exp (/ 1 x)) in y
0.192 * [taylor]: Taking taylor expansion of (/ 1 x) in y
0.192 * [taylor]: Taking taylor expansion of x in y
0.192 * [taylor]: Taking taylor expansion of 1.0 in y
0.192 * [taylor]: Taking taylor expansion of (/ 1 (* x y)) in y
0.192 * [taylor]: Taking taylor expansion of (* x y) in y
0.192 * [taylor]: Taking taylor expansion of x in y
0.192 * [taylor]: Taking taylor expansion of y in y
0.193 * [taylor]: Taking taylor expansion of (- (log (+ (exp (/ 1 x)) 1.0)) (/ 1 (* x y))) in x
0.193 * [taylor]: Taking taylor expansion of (log (+ (exp (/ 1 x)) 1.0)) in x
0.193 * [taylor]: Taking taylor expansion of (+ (exp (/ 1 x)) 1.0) in x
0.193 * [taylor]: Taking taylor expansion of (exp (/ 1 x)) in x
0.193 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.193 * [taylor]: Taking taylor expansion of x in x
0.193 * [taylor]: Taking taylor expansion of 1.0 in x
0.193 * [taylor]: Taking taylor expansion of (/ 1 (* x y)) in x
0.193 * [taylor]: Taking taylor expansion of (* x y) in x
0.193 * [taylor]: Taking taylor expansion of x in x
0.193 * [taylor]: Taking taylor expansion of y in x
0.193 * [taylor]: Taking taylor expansion of (- (log (+ (exp (/ 1 x)) 1.0)) (/ 1 (* x y))) in x
0.194 * [taylor]: Taking taylor expansion of (log (+ (exp (/ 1 x)) 1.0)) in x
0.194 * [taylor]: Taking taylor expansion of (+ (exp (/ 1 x)) 1.0) in x
0.194 * [taylor]: Taking taylor expansion of (exp (/ 1 x)) in x
0.194 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.194 * [taylor]: Taking taylor expansion of x in x
0.194 * [taylor]: Taking taylor expansion of 1.0 in x
0.194 * [taylor]: Taking taylor expansion of (/ 1 (* x y)) in x
0.194 * [taylor]: Taking taylor expansion of (* x y) in x
0.194 * [taylor]: Taking taylor expansion of x in x
0.194 * [taylor]: Taking taylor expansion of y in x
0.194 * [taylor]: Taking taylor expansion of (- (/ 1 y)) in y
0.194 * [taylor]: Taking taylor expansion of (/ 1 y) in y
0.194 * [taylor]: Taking taylor expansion of y in y
0.196 * [taylor]: Taking taylor expansion of (log (+ (exp (/ 1 x)) 1.0)) in y
0.196 * [taylor]: Taking taylor expansion of (+ (exp (/ 1 x)) 1.0) in y
0.196 * [taylor]: Taking taylor expansion of (exp (/ 1 x)) in y
0.196 * [taylor]: Taking taylor expansion of (/ 1 x) in y
0.196 * [taylor]: Taking taylor expansion of x in y
0.196 * [taylor]: Taking taylor expansion of 1.0 in y
0.199 * [taylor]: Taking taylor expansion of 0 in y
0.202 * [taylor]: Taking taylor expansion of 0 in y
0.208 * [taylor]: Taking taylor expansion of 0 in y
0.209 * [approximate]: Taking taylor expansion of (- (log (+ (exp (/ -1 x)) 1.0)) (/ 1 (* x y))) in (x y) around 0
0.209 * [taylor]: Taking taylor expansion of (- (log (+ (exp (/ -1 x)) 1.0)) (/ 1 (* x y))) in y
0.209 * [taylor]: Taking taylor expansion of (log (+ (exp (/ -1 x)) 1.0)) in y
0.209 * [taylor]: Taking taylor expansion of (+ (exp (/ -1 x)) 1.0) in y
0.209 * [taylor]: Taking taylor expansion of (exp (/ -1 x)) in y
0.209 * [taylor]: Taking taylor expansion of (/ -1 x) in y
0.209 * [taylor]: Taking taylor expansion of -1 in y
0.209 * [taylor]: Taking taylor expansion of x in y
0.209 * [taylor]: Taking taylor expansion of 1.0 in y
0.209 * [taylor]: Taking taylor expansion of (/ 1 (* x y)) in y
0.209 * [taylor]: Taking taylor expansion of (* x y) in y
0.209 * [taylor]: Taking taylor expansion of x in y
0.209 * [taylor]: Taking taylor expansion of y in y
0.209 * [taylor]: Taking taylor expansion of (- (log (+ (exp (/ -1 x)) 1.0)) (/ 1 (* x y))) in x
0.209 * [taylor]: Taking taylor expansion of (log (+ (exp (/ -1 x)) 1.0)) in x
0.209 * [taylor]: Taking taylor expansion of (+ (exp (/ -1 x)) 1.0) in x
0.209 * [taylor]: Taking taylor expansion of (exp (/ -1 x)) in x
0.209 * [taylor]: Taking taylor expansion of (/ -1 x) in x
0.209 * [taylor]: Taking taylor expansion of -1 in x
0.209 * [taylor]: Taking taylor expansion of x in x
0.210 * [taylor]: Taking taylor expansion of 1.0 in x
0.210 * [taylor]: Taking taylor expansion of (/ 1 (* x y)) in x
0.210 * [taylor]: Taking taylor expansion of (* x y) in x
0.210 * [taylor]: Taking taylor expansion of x in x
0.210 * [taylor]: Taking taylor expansion of y in x
0.210 * [taylor]: Taking taylor expansion of (- (log (+ (exp (/ -1 x)) 1.0)) (/ 1 (* x y))) in x
0.210 * [taylor]: Taking taylor expansion of (log (+ (exp (/ -1 x)) 1.0)) in x
0.210 * [taylor]: Taking taylor expansion of (+ (exp (/ -1 x)) 1.0) in x
0.210 * [taylor]: Taking taylor expansion of (exp (/ -1 x)) in x
0.210 * [taylor]: Taking taylor expansion of (/ -1 x) in x
0.210 * [taylor]: Taking taylor expansion of -1 in x
0.210 * [taylor]: Taking taylor expansion of x in x
0.211 * [taylor]: Taking taylor expansion of 1.0 in x
0.211 * [taylor]: Taking taylor expansion of (/ 1 (* x y)) in x
0.211 * [taylor]: Taking taylor expansion of (* x y) in x
0.211 * [taylor]: Taking taylor expansion of x in x
0.211 * [taylor]: Taking taylor expansion of y in x
0.211 * [taylor]: Taking taylor expansion of (- (/ 1 y)) in y
0.211 * [taylor]: Taking taylor expansion of (/ 1 y) in y
0.211 * [taylor]: Taking taylor expansion of y in y
0.218 * [taylor]: Taking taylor expansion of (log (+ (exp (/ -1 x)) 1.0)) in y
0.218 * [taylor]: Taking taylor expansion of (+ (exp (/ -1 x)) 1.0) in y
0.218 * [taylor]: Taking taylor expansion of (exp (/ -1 x)) in y
0.218 * [taylor]: Taking taylor expansion of (/ -1 x) in y
0.218 * [taylor]: Taking taylor expansion of -1 in y
0.218 * [taylor]: Taking taylor expansion of x in y
0.218 * [taylor]: Taking taylor expansion of 1.0 in y
0.221 * [taylor]: Taking taylor expansion of 0 in y
0.225 * [taylor]: Taking taylor expansion of 0 in y
0.231 * [taylor]: Taking taylor expansion of 0 in y
0.231 * * * [progress]: simplifying candidates
0.232 * [simplify]: Simplifying using  #<procedure:simplify-batch-regraph> :
   (expm1 (log (+ 1.0 (exp x))))
  (log1p (log (+ 1.0 (exp x))))
  (log (* (cbrt (+ 1.0 (exp x))) (cbrt (+ 1.0 (exp x)))))
  (log (cbrt (+ 1.0 (exp x))))
  (log (sqrt (+ 1.0 (exp x))))
  (log (sqrt (+ 1.0 (exp x))))
  (log 1)
  (log (+ 1.0 (exp x)))
  (log 1)
  (log (+ 1.0 (exp x)))
  (log (+ (pow 1.0 3) (pow (exp x) 3)))
  (log (+ (* 1.0 1.0) (- (* (exp x) (exp x)) (* 1.0 (exp x)))))
  (log (- (* 1.0 1.0) (* (exp x) (exp x))))
  (log (- 1.0 (exp x)))
  (log (+ 1.0 (exp x)))
  (log (log (+ 1.0 (exp x))))
  (exp (log (+ 1.0 (exp x))))
  (* (cbrt (log (+ 1.0 (exp x)))) (cbrt (log (+ 1.0 (exp x)))))
  (cbrt (log (+ 1.0 (exp x))))
  (* (* (log (+ 1.0 (exp x))) (log (+ 1.0 (exp x)))) (log (+ 1.0 (exp x))))
  (sqrt (log (+ 1.0 (exp x))))
  (sqrt (log (+ 1.0 (exp x))))
  (expm1 (+ 1.0 (exp x)))
  (log1p (+ 1.0 (exp x)))
  (* (exp 1.0) (exp (exp x)))
  (log (+ 1.0 (exp x)))
  (exp (+ 1.0 (exp x)))
  (* (cbrt (+ 1.0 (exp x))) (cbrt (+ 1.0 (exp x))))
  (cbrt (+ 1.0 (exp x)))
  (* (* (+ 1.0 (exp x)) (+ 1.0 (exp x))) (+ 1.0 (exp x)))
  (sqrt (+ 1.0 (exp x)))
  (sqrt (+ 1.0 (exp x)))
  (+ (pow 1.0 3) (pow (exp x) 3))
  (+ (* 1.0 1.0) (- (* (exp x) (exp x)) (* 1.0 (exp x))))
  (- (* 1.0 1.0) (* (exp x) (exp x)))
  (- 1.0 (exp x))
  (+ 1.0 (exp x))
  (fma 1 (log (+ 1.0 (exp x))) (- (* y x)))
  (fma (- y) x (* y x))
  (fma (* (cbrt (log (+ 1.0 (exp x)))) (cbrt (log (+ 1.0 (exp x))))) (cbrt (log (+ 1.0 (exp x)))) (- (* y x)))
  (fma (- y) x (* y x))
  (fma (sqrt (log (+ 1.0 (exp x)))) (sqrt (log (+ 1.0 (exp x)))) (- (* y x)))
  (fma (- y) x (* y x))
  (fma 1 (log (+ 1.0 (exp x))) (- (* y x)))
  (fma (- y) x (* y x))
  (expm1 (- (log (+ 1.0 (exp x))) (* x y)))
  (log1p (- (log (+ 1.0 (exp x))) (* x y)))
  (- (* x y))
  (- (* x y))
  (- (* x y))
  (- (* x y))
  (/ (+ 1.0 (exp x)) (exp (* x y)))
  (log (- (log (+ 1.0 (exp x))) (* x y)))
  (exp (- (log (+ 1.0 (exp x))) (* x y)))
  (* (cbrt (- (log (+ 1.0 (exp x))) (* x y))) (cbrt (- (log (+ 1.0 (exp x))) (* x y))))
  (cbrt (- (log (+ 1.0 (exp x))) (* x y)))
  (* (* (- (log (+ 1.0 (exp x))) (* x y)) (- (log (+ 1.0 (exp x))) (* x y))) (- (log (+ 1.0 (exp x))) (* x y)))
  (sqrt (- (log (+ 1.0 (exp x))) (* x y)))
  (sqrt (- (log (+ 1.0 (exp x))) (* x y)))
  (- (pow (log (+ 1.0 (exp x))) 3) (pow (* x y) 3))
  (+ (* (log (+ 1.0 (exp x))) (log (+ 1.0 (exp x)))) (+ (* (* x y) (* x y)) (* (log (+ 1.0 (exp x))) (* x y))))
  (- (* x y))
  (- (* (log (+ 1.0 (exp x))) (log (+ 1.0 (exp x)))) (* (* x y) (* x y)))
  (+ (log (+ 1.0 (exp x))) (* x y))
  (- (log (cbrt (+ 1.0 (exp x)))) (* x y))
  (- (log (sqrt (+ 1.0 (exp x)))) (* x y))
  (- (log (+ 1.0 (exp x))) (* x y))
  (- (log (+ 1.0 (exp x))) (* x y))
  (+ (log (+ (* 1.0 1.0) (- (* (exp x) (exp x)) (* 1.0 (exp x))))) (* x y))
  (+ (log (- 1.0 (exp x))) (* x y))
  (- (* x y))
  (- (+ (log 2.0) (+ (* 0.25 (pow x 2)) (* 0.5 x))) (* 1/2 (/ (pow x 2) (pow 2.0 2))))
  (log (+ (exp x) 1.0))
  (log (+ (exp x) 1.0))
  (+ (* 1/2 (pow x 2)) (+ x 2.0))
  (+ (exp x) 1.0)
  (+ (exp x) 1.0)
  (+ (log 2.0) (+ (* 0.125 (pow x 2)) (* 0.5 x)))
  (- (log (+ (exp x) 1.0)) (* x y))
  (- (log (+ (exp x) 1.0)) (* x y))
0.235 * * [simplify]: iteration  0 :  105  enodes  (cost  724 )
0.251 * * [simplify]: iteration  1 :  236  enodes  (cost  686 )
0.292 * * [simplify]: iteration  2 :  615  enodes  (cost  635 )