# [Haskell], (10119 bytes), score 15

<!-- language-all: lang-hs -->

    (<>)=(:)
    (<<>>)=pred
    (<><>)='z'
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[Try it online!]

[Haskell]: https://www.haskell.org/
[Try it online!]: https://tio.run/nexus/haskell#7VrBboMwDL3zFVY0qUHVKrXHKeS24049Ig6Isq0SBESpVO3nWRjdxqSNUVpBiF4uT3Ecx8E2NiERncijJC4p0bjebOienossfVTHVA/RXhHjjJZL4v56tUoCKRnnQkjpMrcmMy6k0J2fLJ@DQjInVlG2i@mg5UeZisLyKcwp0v2awQ9aM2P1Ur7S4Syg0pJdjz@4TrOelxfxzmmW8xZvi5qs6dLlmuusE@ALPp5TzyYkv0xkzwn/K3aNoM79GqjhjUw4SKG2qAl3NMxhDVUYgLfnsAaHBgDGjDgE4rzMOkPDdO/UyEK3r@BmBMECsDI3wLEtMbUd3@rXn0K0pk7v239Y1Oyg63BDm0sTJHrAhEkZjgdAhQmws8I05beS6QccBtTeF62G4AaMmlrgcDOx4DiG@kU9ZJdbq4KYA1h2B8EPejFWabhX5FF@LLdlQXf0fe@uegc "Haskell – TIO Nexus" 

Defines a function `(<<<>>>)`. Call with `(<<<>>>)()`.

The non-bracket bytes are

    =:
    =pred
    ='z'
    =

###How does it work?
A string `"xyz"` in Haskell is syntactic sugar for a list of characters `['x','y','z']`, which again is syntactic sugar for the subsequent conctruction with `:` and the empty list: `'x':'y':'z':[]`.
By defining `(<>)=(:)` we yield the same string by writing `'x'<>('y'<>('z'<>[]))`. 

Chars are ordered, so `pred` yields the predecessor of each char. 
Using only the char `'z'` and `pred` the string becomes `pred(pred 'z')<>(pred 'z'<>('z'<>[]))`.
By defining `(<<>>)=pred` and `(<><>)='z'` we can represent the string using balanced brackets only:  
`(<<>>)((<<>>)(<><>))<>((<<>>)(<><>)<>((<><>)<>[]))`

The following function `encode` encodes a string with chars smaller or equal to 'z' in this way:

    c x = let l = 122 - fromEnum x  in "(" ++ ([1..l]>>"((<<>>)") ++ "(<><>)" ++ ([1..l]>>")") ++ "<>"
    encode s = concatMap c s ++ "[]" ++ ([1..length s]>>")")