CREATE TABLE table_23386 ("Team & Boat name" TEXT, "Sail no." TEXT, "Flag" TEXT, "Design Firm" TEXT, "Builder" TEXT, "Skipper" TEXT)

Which flag was on the Green Marine's boat?
SELECT "Flag" FROM table_23386 WHERE "Builder" = 'Green Marine'
SELECT "Flag" FROM "table_23386" WHERE "Builder" = 'Green Marine'