East is dealer. Bid the E/W hands.
Scroll down for the full hand, a suggestion/solution and/or explanation
Gino's Suggestion and a Short Explanation
East's 3S bid is key to reach the correct strain in spades. Opener, East - having already denied 4 spades - rebids 3S to show 3 cards (a 'pattern'). The 3S is a choice of games rebid, accepting partner's invitational 2NT bid.