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Update LICENSE.md to include license information about Select2
License details were taken from the LICENSE file in Select2 distribution.
License details were taken from the LICENSE file in Select2 distribution.
a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 c9bcfe2d2ade a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 a60a0e9092c6 | <!doctype html>
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module UniquePerms (
uniquePerms
)
where
-- | Find all unique permutations of a list where there might be duplicates.
uniquePerms :: (Eq a) => [a] -> [[a]]
uniquePerms = permBag . makeBag
-- | An unordered collection where duplicate values are allowed,
-- but represented with a single value and a count.
type Bag a = [(a, Int)]
makeBag :: (Eq a) => [a] -> Bag a
makeBag [] = []
makeBag (a:as) = mix a $ makeBag as
where
mix a [] = [(a,1)]
mix a (bn@(b,n):bs) | a == b = (b,n+1):bs
| otherwise = bn : mix a bs
permBag :: Bag a -> [[a]]
permBag [] = [[]]
permBag bs = concatMap (\(f,cs) -> map (f:) $ permBag cs) . oneOfEach $ bs
where
oneOfEach [] = []
oneOfEach (an@(a,n):bs) =
let bs' = if n == 1 then bs else (a,n-1):bs
in (a,bs') : mapSnd (an:) (oneOfEach bs)
apSnd f (a,b) = (a, f b)
mapSnd = map . apSnd
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