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Romans828 (02-04-2020)
I would think 4. Why 9? It looks like 4 will be filled up before 9 starts even filling at all. I will fill up 4 before the square above can fill up to fill up 9.
Actually, you guys, #5 is the only cup that will fill at all. The spout to 9 is closed right at the bottom. They're all blocked in some way except #5.