drop :: Int -> [A] -> [A]
-- testing 360 combinations of argument values
-- pruning with 4/7 rules
-- looking through 2 candidates of size 1
-- looking through 3 candidates of size 2
-- looking through 5 candidates of size 3
-- looking through 15 candidates of size 4
-- looking through 27 candidates of size 5
-- looking through 41 candidates of size 6
-- looking through 132 candidates of size 7
-- looking through 127 candidates of size 8
-- looking through 458 candidates of size 9
-- tested 495 candidates
drop 0 []  =  []
drop 0 (x:xs)  =  x:xs
drop x []  =  []
drop x (y:xs)  =  drop (x - 1) xs

take :: Int -> [A] -> [A]
-- testing 143 combinations of argument values
-- pruning with 14/21 rules
-- looking through 2 candidates of size 1
-- looking through 3 candidates of size 2
-- looking through 5 candidates of size 3
-- looking through 15 candidates of size 4
-- looking through 27 candidates of size 5
-- looking through 41 candidates of size 6
-- looking through 132 candidates of size 7
-- looking through 127 candidates of size 8
-- looking through 458 candidates of size 9
-- tested 484 candidates
take 0 []  =  []
take 0 (x:xs)  =  []
take x []  =  []
take x (y:xs)  =  y:take (x - 1) xs