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This example shows how to setup an environment running Rails 3 under 1.9.2 with a 'rails3' gem set.
∴ rvm update --head
# ((Open a new shell)) or do 'rvm reload'
# If you do not already have the ruby interpreter installed, install it:
∴ rvm install 1.9.2
# Switch to 1.9.2-head and gemset rails3, create if it doesn't exist.
∴ rvm --create use 1.9.2@rails3