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Don't Open This Book Until You're 9!: Unlock oodles of fun
Nine is the number of worlds in Norse mythology, the number of lives that cats are supposed to have ... and it's the number of years you need to be...
Don't Open This Book Until You're 8!: Unlock oodles of fun
Eight is the number of tentacles on an octopus, the number of planets in our solar system ... and it's the number of years you need to be before you...