Cardano smart contract

What is different between two data.

nSeller :: !PubKeyHash
nSeller :: PubKeyHash

What does mean “!” in Haskell?

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Hi! Sorry, I have just read your reply.
Thanks. You had resolved the matter what I wanted to know mostly.
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skype, telegram, slack, what’s app
If possible, I want to have a relation ship with you.
I have many problems that I want to know with Haskell & Plutus.
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Thanks. :+1: