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The natural 4♣ bid doesn't only show a big hand; it has also an intrinsic meaning to it, and that is "Pard, I don't like spades." Accordingly, responder should expect 0-1 spades from opener. Probably the correct bid by responder would be 5♣ instead of 4♠ (or 4♦ followed by pass to 4♥ if he's inspired). You'll probably go down in 5♣ (assuming you don't go berserk and bid 6♣), but hey preempts work.
4♠ looks pretty natural, to me if partner has 1 ♠ it rates to be the game of choice, assuming two diamonds losers 5♣ would need no losers in hearts and clubs. Even if partner has a ♠ void then 4♠ will have play.

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