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# ::camelize()
 -  upper-case the first letter
 -  upper-case each letter after a _ and remove _
# ::underscore()
 -  lower-case the first letter
 -  lower-case each upper-case letter and add a _ before
 -  lower-case all other letters
# ::humanize()
 -  upper-case the first letter
 -  replaces _ by a space
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