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The biggest problem with this is that it doesn't work every time in real life. Sometimes you just have a table with one short leg.

Iiuc I think it does work, but the only guarantee is the table will be stable. It very likely will not be _level_

Counterexample: Perfectly level floor, one table leg is 10 cm shorter than the rest. No way to make it stable.

Three legged table supremacy!