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         INITIAL_STATE  SOME_STATE     FINAL_STATE
         +-----+        +-----+        +-----+
...
         +-----+   |    +-----+        +-----+
                   |       |
                   +-------+

INITIAL_STATE: {
   ...
...
FINAL_STATE: {
   ...
}

sub initial_state {
   ...
...
}

initial_state();

sub initial_state {
   ...
...
}

initial_state();

sub initial_state {
   ...
...
while ( $state ) {
   $state = $state->();
}