Stream hierarchy with multiple levels

The Project A integration stream on the left has a child stream D1 to its right. Stream D1 has a child stream D2 to its right. Stream D2 has a child stream D3 to its right. Stream D3 delivers changes to its parent D2 and rebases to baselines in its parent. Stream D2 delivers its changes and changes from stream D3 to its parent D1 and rebases to baselines in its parent. Stream D1 delivers its accumulated changes to its parent the integration stream and rebases to baselines in the integration stream.