However, both <cite>(Bramsen et al., 2011</cite>; Gilbert, 2012) and (Prabhakaran and Rambow, 2014 ) group all messages sent by an individual to another individual (at the corpus-level and at the thread-level, respectively) and rely on word-ngram * Authors (listed in alphabetical order) contributed equally. based features extracted from this concatenated text to infer power relations. They ignore the fact that the text comes from separate emails, and that there is a sequential order to them.