LVCombineSRB:

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   Combine the SRB(s) and first stage into a new first stage.
 
   The remaining time of the first stage (after SRB burnout) is treated as
   a new second stage. 

   The original stages 2-N are appended after these first 2 new stages.
   Thus, original stage 2 becomes new stage 3, and so on.

   Since 2015.1
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   Form:
   lv = LVCombineSRB( lv0 )
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   ------
   Inputs
   ------
   lv0       (.)   Original launch vehicle data structure
                       

   -------
   Outputs
   -------
   lv        (.)   Modified data structure with SRBs combined into
                   separate first stage.

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   See also GetStage, ParallelToSerialStages, M2MS
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Children:

LaunchVehicle: LVDatabase/GetStage
LaunchVehicle: VehicleModels/ParallelToSerialStages
Propulsion: MultiStage/M2MS