https://github.com/lerna/lerna/issues/2107#issuecomment-511987691

          +---+
   /----> | B |
  |       +---+
  |
+---+     +---+ -----\
| A | --> | C |       |
+---+     +---+ <-\   |
  |                |  |
  |       +---+ --/   |
   \----> | D |       |
          +---+ <----/