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4.1 Singleton in Partner's Suit

4.2 Doubleton in Partner's Suit

4.3 Unsupported Ace

4.4 Leading Partner's Suit Against Notrump

4.5 Trying for More Tricks

4.6 Our Own Source of Tricks

4.7 4th Best from Our Suit?

4.8 Our Hand is Better Than Partner's

4.9 Did Partner Mean Their Suit

4.10 A Better Chance at Tricks