Ruby on Rails

I am trying to teach myself RSpec and I am working on a lesson that
requires a version of RSpec that is less than 3. I currently have the
following versions for RSpec:

rspec (3.3.0, 2.99.0, 2.9.0)
rspec-core (3.3.2, 2.99.2, 2.9.0)
rspec-expectations (3.3.1, 2.99.2, 2.9.1)
rspec-mocks (3.3.2, 2.99.4, 2.9.0)
rspec-support (3.3.0)

I would like to uninstall all versions 3 or greater so I can work
through this project. I have been trying for most of today and I just
can't seem to figure out how to uninstall just RSpec so I am left with
only less than version 3. Any help is so appreciated!

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