 One problem facing molecular individuation is that, aside from logical connectives and a few other special cases, it is difficult to draw any principled demarcation between canonical and non-canonical relations (Schneider 2011: 106). Which relations are canonical for  SOFA?[9]  Citing the demarcation problem, Schneider espouses a holist approach that individuates mental symbols through total functional role, i.e., every single aspect of the role that a symbol plays within mental activity: