3/6/7 can’t be filled, the hole between 2>3 is plugged.

The line is blocked between 2-3, so 3,6,&7 don’t get anything.

4 before 6 because of the hole in 4.

2 and 3 at the same time.

even if there’s no floor, they will all fill eventually. it may cause another noah’s ark situation, but what matters is that all the containers will be filled.

Is the faucet flowing?

Technically if it’s faster, then at some point 3 will start to get water. Due to 2 overflowing and filling the space between the 2 cups.

6 probably, maybe would, but not 100% sure.

Which means that really 4 can’t fill up over time.

I think there’s a potential for 4 to get wet, even though it can’t fill.

Because the inlet and outlet of 2 are the same size, 2 will always be filled last, if at all. Once 5 is filled, it will spill out the edges of the container rather than back flowing.