title: Generate a unique value for a combination of two numbers
body: <p>Consider I've two numbers 1023232 &amp; 44. I want to generate a unique number representing this combination of numbers. How can i generate it?</p>
  
  <p>Requirement</p>
  
  <p>f(x,y) = f(y,x) and f(x,y) is unique for every (x,y) or (y,x)</p>