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Houdini lets you add your own custom spare inputs to an individual node’s user interface. You can then use that input in your expressions by its index number starting from -1, and the second one will be -2, and so on. 

So it's a way to reference by index, instead of using the whole string path.

Files:
${item.title}

CREATED BY

Masoud
MASOUD SAADATMAND

VFX/FX supervisor.

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