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upper-level

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It tells us that the minimum for the lower level is 8 cells,in which case, by rule 1, the upper level would have 16.On every side, the lower level would account for 3 of the 11 cells,
Let’s look at the other extreme.The upper level can have at most 3 times 8, or 24 cells,which would give a total of 36.
We know we don’t want any sides with all 3′s,so we can place 2′s at opposite corners of the upper level.Now we have 8 of 11 cells per side.
With 36, if we had 3 cells in each chamber,each side of the upper level would already have 9 of its 11 cells,meaning we’d have to leave empty chambers on the lower level.
The acceleration is survivable if:there are twice as many energy cells in the upper level as in the lower level.Every chamber has 1 to 3 energy cells.
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托福TPO阅读真题,经济学人(The Economist)