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SHLOMIF / Graph-Easy-0.72 / t / out / 2_selfloop.txt 
                     +--------------------+
                     |       Start        |
                     +--------------------+
                       |
                       |
                       v
    Until not done   +--------------------+   Until not done
  +----------------- |                    | -----------------+
  |                  |        Main        |                  |
  +----------------> |                    | <----------------+
                     +--------------------+
                       ^ Until not done |
                       +----------------+