title: How to decide if a language is In R or RE or CoRE
body: <p>I have these three languages I don't know how to decide whether the language is in R or RE or coRE </p>
  
  <pre><code>L1={&lt;M&gt;| epsilon belongs to L(M)}
  L2={&lt;M&gt;&lt;w&gt;|M doesn't accept any prefix of w}
  L3={&lt;M&gt;|there exists w where M accepts all the prefixes of w}
  </code></pre>