Where is "embeddable javascript widget Part 4"?

It seems like all parts of "embeddable javascript widget" tutorials are available EXCEPT part 4.

https://gorails.com/episodes/embeddable-javascript-widget-part-4

Any idea where to find it?

OK I found it here: https://gorails.com/series/embeddable-javascript-widgets-with-rails

Looks like I accidentally changed the naming scheme for that episode. 🧐