In-order traversal:
Search 60: Found
Search 90: Not Found
BinarySearchTree Object ( [root] => Node Object ( [data] => 50 [left] => Node Object ( [data] => 30 [left] => Node Object ( [data] => 20 [left] => [right] => ) [right] => Node Object ( [data] => 40 [left] => [right] => ) ) [right] => Node Object ( [data] => 70 [left] => Node Object ( [data] => 60 [left] => [right] => ) [right] => Node Object ( [data] => 80 [left] => [right] => ) ) ) )