max expr size  =    4
  |- on ineqs  =    3
  |- on conds  =    3
max  #-tests   =  500
min  #-tests   =   25  (to consider p ==> q true)
max  #-vars    =    2  (for inequational and conditional laws)

_ :: Int
0 :: Int
1 :: Int
(+) :: Int -> Int -> Int
(*) :: Int -> Int -> Int

x + 0 == x
x * 1 == x
x * 0 == 0
x + y == y + x
x * y == y * x

x <= x * x
x <= x + 1
0 <= x * x