create an insertion mechanism for linked list of unique elements (letters from A to Z), where the elements to insert are given as pairs separated by an arrow '->', which indicates the order. First letter and the letter that points to e.g A -> F, Print the linked list after each insertion A -> F : A->F G -> C : A->F G->C F -> G : A->F->G->C B->A : B->A->F->G->C
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