Variable names in Perl can have several formats. Usually, they must begin with a letter or underscore, in which case they can be arbitrarily long (up to an internal limit of 251 characters) and may contain letters, digits, underscores, or the special sequence :: or '. In this case, the part before the last :: or ' is taken to be a package qualifier; see perlmod. Perl ã®å¤æ°åã¯æ§ã ãªå½¢ãããã¾ãã é常ãå¤æ°åã¯è±æåãä¸ç·ã§
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