== API ==
-- functions --
(+) :: Int -> Int -> Int
id, abs :: Int -> Int
0, 1 :: Int

-- variables --
x, y, z :: Int

== Testing ==
Depth 1: 6 terms, 3 tests, 12 evaluations, 6 classes, 0 raw equations.
Depth 2: 41 terms, 500 tests, 16556 evaluations, 19 classes, 22 raw equations.
Depth 3: 366 terms, 500 tests, 177899 evaluations, 128 classes, 238 raw equations.
Depth 4: 1080 terms, 500 tests, 520862 evaluations, 243 classes, 837 raw equations.
837 raw equations; 243 terms in universe.

== Equations about (+) ==
  1: x+y == y+x
  2: x+0 == x
  3: x+(y+z) == y+(x+z)

== Equations about id ==
  4: id x == x

== Equations about abs ==
  5: abs 0 == 0
  6: abs 1 == 1
  7: abs (abs x) == abs x

== Equations about several functions ==
  8: abs x+abs x == abs (x+x)
  9: abs (x+abs x) == x+abs x
 10: abs (abs x+abs y) == abs x+abs y
 11: abs (abs x+(x+x)) == x+abs (x+x)
 12: abs x+abs (x+x) == abs (x+(x+x))
 13: abs (abs x+(x+1)) == abs x+(x+1)
 14: abs x+abs (x+1) == abs (x+(x+1))