Question: ( * * The idea is to use either: ` yield _ left ` , ` yield _ right ` , or ` yield _

(**
The idea is to use either: `yield_left`,`yield_right`, or `yield_def`.
*)
Theorem g1_step_4:
Hw5Util.Yield g1["{"; "}"; "{"; "C"; "}"]["{"; "}"; "{"; "}"].
Proof.
(* Apply the yield_def rule with the appropriate parameters *)
apply yield_def with (u :=["{"; "}"])(v :=[])(A :="C")(w :=["{"; "C"; "}"]).
(* First subproof: u ++[A]++ v =["{"; "}"]++["C"]++[]*)
- simpl. left. reflexivity.
(* Second subproof: u ++ w ++ v =["{"; "}"]++["{"; "C"; "}"]++[]*)
- simpl.
Admitted.
Can you guys help me complete this Coq theorem

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