Nonraven

Similarly, there are various ways of gathering the data that something is a nonblack nonraven.

Let us return to the hypothesis that generated the paradox: All nonblack things are nonravens.

Hempel remarks that if we know that we are indoors, and so that the object under examination is a nonraven, then we have no need to check whether it is nonblack (ie, to do ornithology indoors) in order for our report of that object to logically entail H's development.