Flowchart: Parallel Edges with Back Edges (TD)

Four edges down and two back between the same two nodes in a top-down graph (#1826). In the ASCII panel the faces they share grow so each edge keeps its own arrowhead.

flowchart-parallel-edges-with-back-edges-td.mmd
flowchart TD
  A -->|f1| B
  A -->|f2| B
  A -->|f3| B
  A -->|f4| B
  B -->|b1| A
  B -->|b2| A
Output
Flowchart, Zombie Mermaid f1 f2 f3 f4 b1 b2 A B

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