haskell - Why I get indentation errors with nested let/guard block -


I am in the middle of writing a transpose function as a practice for the real world

< / P> 

  transpose :: [i] four] - & gt; [Four] x = let's repeat lines = x transposed = tip split tab :: [string] -> [String] tax x | Zero xs = [] | All taps xs = [] | Otherwise = Protect = "" =>> Safe Head X = Head Secure Tiles "" = "" Secure Tile x = In Tail X (Map Safe Head X) :( Tip (Map Protected Tiles Xs )) Without transpose

the parsing error is & gt; & gt; . . 

  After applying, I tried to write this code again:  :: [string] -> [string] tax x | zero xs = [] | all tap xs = [] | Otherwise = (map safe Ed X): (tip secure tail xs) where the safe head "" = '' safe head x = head x secure tail "but still that indentation error can not be cured. How can I write nested let / while / guard properly?   
 
 
 The error is on the previous row -  ''  is not a valid character: 
 / P> 
  securehead "" = '' safe head x = head x

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