Maple has very useful command op(expression) 
<https://www.maplesoft.com/support/help/maple/view.aspx?path=op>  which 
basically extracts operands of the expression to an expression sequence. 
For example, gives two lists and if I want to join the two lists into one 
list, I could do

L1:=["A","B","C"];
L2:=["E","F","G"];
L3:=[ op(L1) , op(L2) ];

              L3 := ["A", "B", "C", "E", "F", "G"]
How would one do the same thing in Fricas? concat() does not work. Also 
concat only works on string while the above Maple code works on any type of 
list.

Does Fricas have something similar to Maple's op?

Thanks
--Nasser

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