title: How to cons an argument to every list in a list of lists?
body: <p>I'm trying to take in an argument A and a list L in the function<code>(consToAll A L)</code> and cons the argument into every sublist of that list. </p>
  
  <p>What is the best way of going about this?</p>
  
  <p><strong>This is the desired output:</strong></p>
  
  <p>If L is <code>( (1) (2) (3) )</code>
  then <code>(consToAll 'a L)</code> 
  returns:</p>
  
  <p><code>( (a 1) (a 2) (a 3) )</code>.</p>