Are fruits in general on the fence of being part of the lunch or snack or is it specifically the banana? lol. If other fruits are considered lunch then the banana is lunch. If other fruits are considered snacks then the banana is a snack. If the banana, specifically, is on the fence then I'd consider it lunch since you have limit to the amount of yen you can spend on snacks. I assume kids would rather have desserts and candy rather than a banana.
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