扩充分支总是包含在当前步骤遍历的顶级列表中。
The enrichment branch is always contained within the top-level list that the current step is iterating through.
程序集中的每一步都将整个分层输入传递到输出，另外一个额外的扩充分支被添加到输出中，包含步骤计算的结果。
Each step in the assembly passes the entire hierarchical input to the output, plus an additional enrichment branch is added to the output that contains the result of the step computation.
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