lines are published results by Hall and Nivre 2008 ( HN08 ) , Maier et al 2012 ( M12 ) , van Cranenburgh 2012 ( C12 ) , Kallmeyer and Maier 2013 ( KM13 ) , van Cranenburgh and Bod 2013 ( CB13 ) , and Versley 2014a , 2014b ( V14a , V14b ) .