Haskell: Convert list of words to a sentence.

Prelude> let wordsToSentence list = [c | word <- list, c <- word]
Prelude> 
Prelude> wordsToSentence ["Hello", "PTR", "How", "are", "you"]
"HelloPTRHowareyou"

Observe above output, it is not looks like a sentence, let me add some space between words.

Prelude> let wordsToSentence list = [c | word <- list, c <- ' ' : word]
Prelude> 
Prelude> wordsToSentence ["Hello", "PTR", "How", "are", "you"]
" Hello PTR How are you"

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