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Neither. Solid can be the least flexible or the most rigid.
Most common is the thing that happens most, and least common is the least ocuring thing. For example it is most common to open chess with middle pawn forward. And it is least common to move one of the far pawns first.
Most.
At least (and at most).
I don't think there is such a thing. There is a "Golgi complex", also known as the "Golgi apparatus", but it is not related to numbers.