title: How can i use haskell to check if a list contains the values in a tuple
body: <p>I am writing some functions for graphs in Haskell, and I want to check if a list of integers, such as </p>
  
  <pre><code>[1,4, 5, 7]
  </code></pre>
  
  <p>contains vertices that make an edge, which i have represented as a tuple, like so</p>
  
  <pre><code>(1,5)
  </code></pre>
  
  <p>Im trying to take a function that takes the list and the tuple, and in this case would return true, because the list contains a 1 and a 5. The main issue i am having is that im really not sure how to search a list in Haskell. Is their a function that takes a list of type [a] and a value of type a, and returns a Bool, depending on whether [a] contains a? </p>