Create first tree as shown in example
root1 = None NEW_LINE root1 = insert ( root1 , 5 ) NEW_LINE root1 = insert ( root1 , 1 ) NEW_LINE root1 = insert ( root1 , 10 ) NEW_LINE root1 = insert ( root1 , 0 ) NEW_LINE root1 = insert ( root1 , 4 ) NEW_LINE root1 = insert ( root1 , 7 ) NEW_LINE root1 = insert ( root1 , 9 ) NEW_LINE