public Parser sourceComputerParagraph() {
        if (sourceComputerParagraphParser == null) {
           FutureParser future = scoped("sourceComputerParagraph");
           sourceComputerParagraphParser = future;
           future.setParser(
               sequence(
                   token("SOURCE-COMPUTER"),
                   token("."),
                   optional(
                       sequence(
                           computerName(),
                           optional(
                               withDebuggingMode()
                           ),
                           token(".")
                       )
                   ),
                   optional(
                       skipto(
                           choice(
                               paragraphStart(),
                               sectionStart(),
                               divisionStart()
                           )
                       )
                   )
               )
           );
        }

        return sourceComputerParagraphParser;
    }