Parallelogram Shapes (BT)

Parallelogram `[/x/]` and reverse parallelogram `[\x\]` for input and output steps, drawn bottom to top.

parallelogram-shapes-bt.mmd
graph BT
  A[/Read Input/] --> B{Valid?}
  B -->|yes| C[\Write Output\]
  B -->|no| D[/Ask Again/]
Output
Flowchart, Zombie Mermaid yes no Read Input Valid? Write Output Ask Again

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