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  1. or download this
        if ($a) {
        if ($b) {
...
            &S4;
        }
    }
  2. or download this
                                       +-----(b)->[S1]--+
                                   |                |
...
              +-(not-a)->[test c]--+                |--+
                                   |                |
                                   +-(not-c)->[S4]--+
  3. or download this
                                 +-----(b)->[S1]-+
                             |               |
...
         +-(not-a)->[test c]-+                 |
                             |                 |
                             +-(not-c)->[S4]---+
  4. or download this
                                   +-----(b)->[S1]->[S5]-+
                               |                     |
...
          +-(not-a)->[test c]--+                     |--+
                               |                     |
                               +-(not-c)->[S4]->[S6]-+