Inside an A node Finished C node: A1B2C1Finished C node: A1B2C2Finished C node: A1B2C3| | Finished C node: A1B3C4 Inside an A node | A2B4C5D3E1,Finished C node: A2B4C5 Inside an A node | A3B5C6D4E2,| A3B5C6D5E3,Finished C node: A3B5C6| | A3B5C7D7E4,A3B5C7D7E5,A3B5C7D7E6,| Finished C node: A3B5C7| A3B9C8D9E7,Finished C node: A3B9C8