Driver program to test for above functions
root = new Node ( 20 ) ; root . left = new Node ( 8 ) ; root . right = new Node ( 22 ) ; root . left . left = new Node ( 4 ) ; root . left . right = new Node ( 12 ) ; root . left . right . left = new Node ( 10 ) ; root . left . right . right = new Node ( 14 ) ; document . write ( " " ) ; printLevels ( root , 2 , 3 ) ;