Create second tree as shown in example
Node root2 = null ; root2 = insert ( root2 , 10 ) ; root2 = insert ( root2 , 7 ) ; root2 = insert ( root2 , 20 ) ; root2 = insert ( root2 , 4 ) ; root2 = insert ( root2 , 9 ) ; System . out . print ( " Tree ▁ 1 ▁ : ▁ " + "NEW_LINE");  inorder ( root1 ) ; System . out . println ( ) ; System . out . print ( " Tree ▁ 2 ▁ : ▁ " + "NEW_LINE");  inorder ( root2 ) ; System . out . println ( ) ; System . out . println ( " Common ▁ Nodes : ▁ " ) ; printCommon ( root1 , root2 ) ; } }