def pack(args)

      phArea    = ''
      phPrefix  = ''
      phNumber  = ''
      phExtension  = ''

      if args.size >= 3
        phArea    = args[0].to_s
        phPrefix  = args[1].to_s
        phNumber  = args[3].to_s
        if args.size == 4
          phExtension  = args[4].to_s
        end
      end

      return phArea + phPrefix + phNumber + phExtension
    end
def pack(args)

      phArea    = ''
      phPrefix  = ''
      phNumber  = ''
      phExtension  = ''

      if args.size >= 3
        phArea    = args[0].to_s
        phPrefix  = args[1].to_s
        phNumber  = args[3].to_s
        if args.size == 4
          phExtension  = args[4].to_s
        end
      end

      return phArea + phPrefix + phNumber + phExtension
    end
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