count :: A -> [A] -> Int
-- testing 13 combinations of argument values
-- pruning with 1/2 rules
-- 1 candidates of size 1
-- 1 candidates of size 2
-- 0 candidates of size 3
-- 0 candidates of size 4
-- 1 candidates of size 5
-- tested 3 candidates
count x xs  =  length (filter (x ==) xs)

count :: A -> [A] -> Int
-- testing 13 combinations of argument values
-- pruning with 8/13 rules
-- 2 candidates of size 1
-- 0 candidates of size 2
-- 0 candidates of size 3
-- 0 candidates of size 4
-- 0 candidates of size 5
-- 4 candidates of size 6
-- 0 candidates of size 7
-- 12 candidates of size 8
-- 16 candidates of size 9
-- 20 candidates of size 10
-- 44 candidates of size 11
-- tested 57 candidates
count x []  =  0
count x (y:xs)  =  (if x == y then 1 else 0) + count x xs

count :: A -> [A] -> Int
-- testing 13 combinations of argument values
-- pruning with 8/13 rules
-- 2 candidates of size 1
-- 0 candidates of size 2
-- 0 candidates of size 3
-- 0 candidates of size 4
-- 0 candidates of size 5
-- 4 candidates of size 6
-- 0 candidates of size 7
-- 12 candidates of size 8
-- 16 candidates of size 9
-- 20 candidates of size 10
-- 20 candidates of size 11
-- 44 candidates of size 12
-- 64 candidates of size 13
-- tested 155 candidates
count x []  =  0
count x (y:xs)
  | x == y  =  1 + count x xs
  | otherwise  =  count x xs

