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v4.0
    v4.0

    prev_n

    System alias prev_n can only appear in basic templates.

    Previous node prev_n:

    • Consider the edge or node represented by a single-edge/node template shown in (a) and (b), their prev_n refers to their preceding node;
    • Consider the edges or nodes represented by a multiple-edge template shown in (c) and (d), their prev_n refers to their respective preceding node.
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