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Creating a method in a class and using it in Ruby

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so im trying to write a simple timer program in ruby. I defined my methods in a "Timer" class but when I call them it gives me a NoMethodError. Any ideas why? Thanks for the help.

require "Time"
class Timer

 def start
  $a =


def stop - $a


puts "Type in 'Start'to to start the timer and then type 'Stop' to stop it"
s = gets.start
st = gets.stop
puts st

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