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callgg(f,x,y,...) -- calls the engine with engine command string f, after pushing engine objects corresponding to x, y, ... onto the engine's stack.

Code:

     -- ../../../Macaulay2/m2/gbinterface.m2:7-9
     callgg = args -> (
          sendgg (apply(#args-1, i -> ggPush args#(i+1)), args#0)
          )

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