Analyze the Explanation

Which of the many features of the objects are relevant to the target concept?
Those that appear in the explanation we just built.
We can collect these and substitute x,y for o1,o2 to get
Volume(x,2) ∧ Density(x,0.3) ∧ Type(y,endtable) → SafeToStack(x,y)
So, we now have the most general set of features, right?
Wrong! An even more general rule can be obtained using a more careful analysis of the explanation.