Multiple extensibility action scripts or flows that split pathways to contribute to the same output. 

version: "1"
flow: 
 flow_start:  
  next: forkAction  
forkAction:  
  fork:    
   next: [action1, action2]  
action1:   
 action: <action_name>  
 next: action3  
action3:  
  action: <action_name>    
  next: action4  
action4:  
  action: <action_name>  
   next: action7  
action7:  
  action: <action_name>                
action2:  
  action: <action_name>
Note: You can loop back to a previous action by assigning it as the next: action. For example, instead of next: flow_end to end your action flow, you can enter next: action1 to rerun action1 and restart the sequence of actions.
The forking action flow allows for actions to follow split pathways.

Clarification on the fork element position on the image. Fork Element