title: How to spread a tibble conbined with strsplit?
body: <p>I need to spread a tibble where one column has many elements to split, and they're not the same length. I put the orginal sample and predicted outcome below. Thanks.</p>
  <pre><code>a;b;c | 2016
  d;e  | 2019
  </code></pre>
  <p>converts it into:</p>
  <pre><code>a | 2016
  b | 2016
  c | 2016
  d | 2019
  e | 2019 
  </code></pre>