We thus concentrate on two experimental protocols-the one described by <cite>Kim et al. (2014)</cite> (referred to as Kim protocol) and the one from Kulkarni et al. (2015) (referred to as Kulkarni protocol), including close variations thereof. Kim's protocol operates on uniformly sized samples of 10M 5-grams for each year from 1850 onwards in a continuous fashion (years before 1900 are used for initialization only). Its constant sampling sizes result in both oversampling and undersampling as is evident from Figure 1 .