We observe that two specific feature groups, Structural and Lexical, individually achieve high F1 scores and when combined with other features, they assist the classifier in reaching F1 scores in high 80s%. There can be two explanations for this: 1) essays in T OEF L arg have multiple short paragraphs where the position features such as position of the arguments in the essay and paragraph (Structural group) are strong indicators for argument relations; and 2) due to short paragraphs, the percentage of N S instances are less than in the <cite>S&G</cite> dataset, hence the Lexical features (i.e., word-pairs between Arg 1 and Arg 2 ) perform very well.