<prompt> Translate the following text to SwahiliSingle-unit FGD installations have occurred in as little as 20-21 months9, and multiple FGD systems have been installed within 36 months.  <response>: Mfumo wa FGD wa kitengo kimoja umefanywa katika miezi 20 hadi 21, na mifumo mingi ya FGD imewekwa ndani ya miezi 36. 