The Official Answer: The “Zero-Glass” Solution
The answer is simple, slightly annoying, and technically correct: None of them.
If you look at the source of the water (the faucet), the pipe doesn’t actually connect to the pipes leading to the glasses. There is a clear physical gap between the tap and the piping system. The water is effectively just flowing into thin air, or at the very least, it’s missing the entire network.
Even if you assume the pipes are connected, if you trace the lines carefully:
Glass 1, 2, 3, 5, 6, and 7 are all blocked by dead ends or loops that prevent water from actually entering the glass.
Glass 4 is the only one that looks like it has a clear path, but it’s blocked by the pipe structure itself!
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