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perhaps that line was written by someone used to Perl, where they would have had

@a_list_of_words = qw/my list of words/;

there



Or rubyst:

  a_list_of_words = %w{my list of words}


You'd be sure if they wrote:

    >>> qw = str.split
    >>> qw('my list of words')
    ['my', 'list', 'of', 'words']




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