With 22+ points and/or 4 losers or less always open with the forcing to Game Convention bid of 2♣. 
The Conventional negative response is 2♦, showing 0-7 points and a virtual sign that Slam is most unlikely and Opener must contend himself with a Game score contract. 
 In this case however West made a positive response of 2♠, which shows 8+ points and a 5+card spade suit. It is also an immediate sign that Opener should aim for a Slam.  
So what does East  bid next  ?
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