Two things I want to clarify:
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Not all list structures and intended function mappings are possible through list levels (or lacing). Nodes have an inherent function mapping based on expected list structure. List levels allow you to redefine the input structures of a node but cannot overcome this inherent mapping when too many list levels (in the structure) are used.
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The number (and location) of list levels in a given list structure are shown at the bottom of the node preview. If you want to count arrows, it’s actually the number or arrows plus two (the top level list and item level don’t have arrows to expand/collapse).
