[O] Make beamer items ticked or alerted via overlay?

[Loris Bennett]

Hi,

When writing a beamer presentation with Org, is it possible to use an
overlay to first produce a list, like

- apples
- beetroots
- cauliflowers
- damsons
- eggs

and then either change the colour of some subset of the items, or put a
tick after each one, e.g.

- apples
- beetroots ✓
- cauliflowers
- damsons ✓
- eggs

?

Cheers,

Loris

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