Differences between flatten trees, trim trees, match trees, path mapper

Grasshopper
1

Hello everyone.
Can you explain the diffences between flatten trees, trim trees, match trees, path mapper?
thank you for your time

2

Flatten Tree: puts all items in one list no matter what
Trim Tree: removes the outer branches of a data tree (similar to shift paths)
Match Tree: tries to match the structure of a data tree to another data trees structure
Path Mapper: lets you manually define different ways to structure the data tree

All this wont make much sense unless you get familiar with data trees. You can start here at page 105: https://aae280.files.wordpress.com/2014/10/mode-lab-grasshopper-primer-third-edition.pdf

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