I think this:
#declare X=-50;
#while (X<50)
  #declare Z=-50;
  #while (Z<50)
    sphere { <X,5*(sin(X/30) +sin(Z/30)),Z>,1 }
    #declare Z=Z+1;
  #end;
  #declare X=X+1;
#end
will do what you want.

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