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"POSIX.1 Chap. 7.3.1
space
Define characters to be classified as white-space characters.
In the POSIX locale, at a minimum, the <space>, <form-feed>, <newline>, <carriage-return>, <tab>, and <vertical-tab> shall be included.
In a locale definition file, no character specified for the keywords upper, lower, alpha, digit, graph, or xdigit shall be specified. The <space>, <form-feed>, <newline>, <carriage-return>, <tab>, and <vertical-tab> of the portable character set, and any characters included in the class blank are automatically included in this class.
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