Digit Recognition
A digit recognition system understands digits that look like these (in green):
Each digit is made up of up to 7 segments. But not all segments are necessary to recognize a digit. It is possible to understand a digit if only some of the segments are visible.
Among the ten digits 1, 2, ..., 9, 0 in green above, which digit has all those segments that are absolutely necessary to identify all of the ten digits unambiguously?
The answer is 0.
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