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require 'optparse'
parser = OptionParser.new
parser.on('-xXXX', ['foo', 'bar'], 'Values for required argument' ) do |value|
p ['-x', value]
end
parser.on('-y [YYY]', ['baz', 'bat'], 'Values for optional argument') do |value|
p ['-y', value]
end
parser.parse!
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