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    3 -> 2 [ label = "+" ]
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    2 -> 1 [ label = "×" ]
    6 -> 5 [ label = "+" ]
    7 -> 5 [ label = "+" ]
    5 -> 1 [ label = "×" ]
    1 -> 0 [ label = "^" ]
    8 -> 0 [ label = "^" ]
}