However, it is not flexible with regards to (C3), or the sense granularity problem, as it requires the users to specify the number of senses: Current systems (<cite>Wang et al. 2015</cite>; Chang, Pei, and Chen 2014) required to set the number of senses to a small number (set to 3 or 5 in the literature) to get a good accuracy, however many words may have a large number of senses, e.g. play in Figure 1 .