on 'general - Keyboard shortcuts' why are there two fields for every command?

Development Getting Started & Setup
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1

There are two fields for every command. Is this just a convienient means of assigning two different shortcuts to a command? or is this something to do with key chords??

The documentation does not touch on this at all, I would like to know conclusively. Thanks for any clarification.

2

In the documentation:

Customizing Keyboard Shortcuts

It says:

Each command can have up to two keyboard shortcuts associated with it

So it looks like it is just two slots. (I have seen many programs with 1 slot per command, or many slots per command, but never exactly two.)