/usr/share/php/Symfony/Component/CssSelector/Parser/ is in php-symfony-css-selector 2.3.21+dfsg-4+deb8u3.
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/usr/share/php/Symfony/Component/CssSelector/Parser/Handler/
/usr/share/php/Symfony/Component/CssSelector/Parser/Handler/CommentHandler.php
/usr/share/php/Symfony/Component/CssSelector/Parser/Handler/HandlerInterface.php
/usr/share/php/Symfony/Component/CssSelector/Parser/Handler/HashHandler.php
/usr/share/php/Symfony/Component/CssSelector/Parser/Handler/IdentifierHandler.php
/usr/share/php/Symfony/Component/CssSelector/Parser/Handler/NumberHandler.php
/usr/share/php/Symfony/Component/CssSelector/Parser/Handler/StringHandler.php
/usr/share/php/Symfony/Component/CssSelector/Parser/Handler/WhitespaceHandler.php
/usr/share/php/Symfony/Component/CssSelector/Parser/Parser.php
/usr/share/php/Symfony/Component/CssSelector/Parser/ParserInterface.php
/usr/share/php/Symfony/Component/CssSelector/Parser/Reader.php
/usr/share/php/Symfony/Component/CssSelector/Parser/Shortcut/
/usr/share/php/Symfony/Component/CssSelector/Parser/Shortcut/ClassParser.php
/usr/share/php/Symfony/Component/CssSelector/Parser/Shortcut/ElementParser.php
/usr/share/php/Symfony/Component/CssSelector/Parser/Shortcut/EmptyStringParser.php
/usr/share/php/Symfony/Component/CssSelector/Parser/Shortcut/HashParser.php
/usr/share/php/Symfony/Component/CssSelector/Parser/Token.php
/usr/share/php/Symfony/Component/CssSelector/Parser/TokenStream.php
/usr/share/php/Symfony/Component/CssSelector/Parser/Tokenizer/
/usr/share/php/Symfony/Component/CssSelector/Parser/Tokenizer/Tokenizer.php
/usr/share/php/Symfony/Component/CssSelector/Parser/Tokenizer/TokenizerEscaping.php
/usr/share/php/Symfony/Component/CssSelector/Parser/Tokenizer/TokenizerPatterns.php