Original sentence: A 17a - production version with Gnome et Rhône- or Siemens-built Bristol Jupiter engine.A 21 Photomöwe - photographic fitted with BMW VI engine (1 built)
Edited sentence: A 17a - production version with Gnome et Rhône- or Siemens-built Bristol Jupiter engine (11 built).A 21 Photomöwe - photographic fitted with BMW VI engine (2 built).A 26 - passenger aircraft fitted with Siemens VI engine (1 built)