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# The idea is that each morse code is encoded as a number: 
# "a" is mapped to 19, which in base 3 is 201, the 2 works as a dummy to keep leading 0's in place, so the real value is "01" which maps to the morse code ".-"
# "b" is mapped to 189, which in base 3 is 21000, remove the 2 and the real value is "1000" which maps to the mores code "-..."
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a ||= Hash.new([])  # default value for non-existing keys is now an empty array, unless a was already defined

a[:k] # => []
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def self.find_by_url_like(url)
  # make sure url has a scheme before URI parses
  uri = url.match(/^https?:\/\//) ? URI.parse(url) : URI.parse("http://#{url}") 
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