  The second, interrelated feature is that the Mohists regard cognition, judgment, and inference as processes of analogical pattern recognition — specifically, processes of distinguishing relevantly similar kinds of objects, events, or actions from dissimilar  ones.[7]  This sort of process is referred to as distinguishing (bian) what is “this” (shi) from what is “not” (fei). (Shi and fei are pronounced roughly “shr” and “fey.”) Drawing such distinctions is a practical skill, the execution of which can be aided by reference to models or exemplars — that is, fa.  Fa are in effect reference prototypes for use in pattern recognition.