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<? function name_of_module_theme() { return array( 'name_of_theme_function' => array( 'arguments' => array('items' => NULL) ) ); }

<? function theme_name_of_theme_function($items = NULL) { $output = 'hey, this is some output that gets generated when theme_name_of_theme_function($items) is called from somewhere'; return $output; }