void f5() - How many internal nodes are there in the BST? Output in the file f5.txt must be the following: (line 1: in-order traversal, line 2: the amount of internal nodes)
(L,1,5) (H,2,6) (Q,3,1) (D,4,3) (B,6,-4) (M,7,9) (X,8,7) (G,9,-6)
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