We follow the work of <cite>Stab & Gurevych (2016)</cite> and focus on three different types of features to represent our ACs: 1) Bag-of-Words of the AC; 2) Embedding representation based on GloVe embeddings (Pennington et al., 2014) ; 3) Structural features: Whether or not the AC is the first AC in a paragraph, and Whether the AC is in an opening, body, or closing paragraph.