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 10.1 Calculating length of strings
 ==================================
 
 The length of a string can be calculated by `len':
 
  -- Builtin: len (STRING)
      Expands to the length of STRING, as a decimal number.
 
      The macro `len' is recognized only with parameters.
 
      len()
      =>0
      len(`abcdef')
      =>6
 
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