0.537 * [progress]: [Phase 1 of 3] Setting up.
0.001 * * * [progress]: [1/2] Preparing points
0.017 * * * [progress]: [2/2] Setting up program.
0.019 * [progress]: [Phase 2 of 3] Improving.
0.019 * [simplify]: Simplifying using  #<procedure:simplify-batch-regraph> :
   (/ (* 4.0 (- (- x y) (* z 0.5))) z)
0.020 * * [simplify]: iteration  0 :  10  enodes  (cost  11 )
0.021 * * [simplify]: iteration  1 :  20  enodes  (cost  11 )
0.024 * * [simplify]: iteration  2 :  47  enodes  (cost  11 )
0.031 * * [simplify]: iteration  3 :  138  enodes  (cost  10 )
0.057 * * [simplify]: iteration  4 :  319  enodes  (cost  10 )