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module Operators where
(+++) :: [a] -> [a] -> [a]
a +++ b = a ++ b ++ a
($$$) :: [a] -> [a] -> [a]
a $$$ b = b +++ a
(***) :: [a] -> [a] -> [a]
(***) a [] = a
(***) a (_:b) = a +++ (a *** b)
(*/\*) :: [[a]] -> [a] -> [a]
a */\* b = concatMap (*** b) a
(**/\**) :: [[a]] -> [[a]] -> [[a]]
a **/\** b = zipWith (*/\*) [a +++ b] (a $$$ b)
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