val input  = Source(List(List(1, 2, 3), List(1, 2, 3), List(), 
List(),List(),List(),List(1, 2, 3))


1) Process input. for example input.via(throttleFlow).mapConcat(t => t)

where throttleFlow show do the *following:*


2) If element of source has size > 0 pass it immediately  downstream.

3) Or if element of source has size == 0 wait 10 secs


Can this be done with the build in stages?


  

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