Here is what I'm trying to do

class List
  # Method item
  #   Pushes an item into an array @items
  # Method to_s
  #   returns elements within @items into a string
end

class Groceries < List
  item :lettuce
  item :potato
  item :ham
end

print Groceries.new

The trouble I'm having is figuring out how to go about adding an
instance variable, which is an array, and will be updated using these
attr like methods (I don't know what these are called which is giving me
some trouble). Is this possible to pull off?
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