title: Count how many times certain text combinations occurs in certain columns
body: <p>I have a data set with multiple columns and roughly 1000 rows. I need to find out how many times certain combinations of columns can be found within the data set. </p>
  
  <p>In my example below, columns <code>A:B</code> represents the raw data set. In <code>C2</code> I have a formula that finds all non-unique combinations from columns <code>A:B</code>. What I need is a formula that counts how many times combinations in columns <code>C:D</code> are found within columns <code>A:B</code>. The desired output should be in <code>ColE</code>.</p>
  
  <p><img src="https://i.stack.imgur.com/XCHsk.png" alt="Pleas see this example!"></p>