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How many pearl versions can I install?

I got this kind of problem when I start gem install -v=2.3.12 rails, and cli tells me that it is installed successfully. But when I start gem list rails, it is not on the list of available rails versions.

I'm not sure why this does not work, but I noticed that for each gem in the list there are no more than 6 versions of a particular gem. Is there a limit on the number of versions that you can use for a particular gem?

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Is there a limit on the number of versions that you can use for a particular stone

: http://docs.rubygems.org/read/chapter/2 gem list, .

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