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Perl Language Reference Manual
by Larry Wall and others
Paperback (6"x9"), 724 pages
ISBN 9781906966027
RRP £29.95 ($39.95)

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Undefined subroutine &%s called

(F) The subroutine indicated hasn't been defined, or if it was, it has since been undefined.

ISBN 9781906966027Perl Language Reference ManualSee the print edition