Variable                                Description                           
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  source_variable_1                                                             
  string standard mandatory               The first source variable.            
  Default: val1                                                                 
  source_variable_2                                                             
  string standard mandatory               The second source variable.           
  Default: val2                                                                 
  my_variable                                                                   
  choice standard mandatory               A variable.                           
  Choices:                                                                      
                                                                                

 • the value of the variable "source_variable_1".                               
 • the value of the variable "source_variable_2". Default: val1                 
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