Eventually, humans develop very sophisticated and extensive repertoires of arbitrarily applying relational responses based on contextual cues to do so.
Relations of sameness, similarity, or identity
Relations of difference or distinction
Relations of opposition
Relations of comparison (usually along a specific dimension)
Relations dealing with the arrangement of objects in space
Relations of comparison along the dimension of hierarchical class membership
Relations of comparison along the dimension of time
Relations specifying causality (cause-effect) or conditionality (if-then)
Relations specified in terms of the perspective of the speaker