Documentation on commands that can run in commands?

trying to find what commands can be entered during a command like subcrv

thanks

Hi -
From Rhinoceros Help

View and construction plane manipulation and object snaps are nestable. Geometry creation commands are not nestable.
One-shot object snaps and sub-object picking filters are automatically nestable and do not require an apostrophe.

Also, the Length, Radius, and Distance commands are nestable.
-wim

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