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I have seen it used for instance here but cannot (yet) find it in the animation nodes manual
How to Do Kinetic Text with Animation Nodes?
Where do I find this node?
These nodes were added later, that is why they are not mentioned in the manual. There are two ways to find any node:
Press Ctrl+A then a search-menu will appear, type the name of the node:
Press Shift+A or click on add option in the header then a nodes-menu appear where you can find the required nodes:
Required, but never shown