Which of these are examples of reasons to prefer reasoning in terms of features rather than in terms of states when addressing a problem?

Select all that apply.

1)	Features are independent of each other.

2)	The number of features necessary to reason about a system is often many fewer than the number of states in such a system.

3)	States can be defined in terms of features, but features cannot be defined in terms of states.

4)	It is often more natural to reason about a system in terms of its features than in terms of its states.