title: What does an NFA with epsilon transitions let us do?
body: <p>I have the following automaton. I am supposed to understand the use of empty transitions through it. <img src="https://i.stack.imgur.com/r3eO4.png" alt="NFA with empty transition"></p>
  
  <p>I think that the regular expression of this automaton is the following: 0* 1* 2*</p>
  
  <p>I just want to know what this automaton lets us do? in other words what is the use of empty transitions in that case?</p>