Okay, I think I have finally straightened it out. All the `engine` modules are supposed to be there...

# library-development

[Joe]

Okay, I think I have finally straightened it out. All the engine modules are supposed to be there, I guess. The PlayingCardsEngine group is not (but the top level module should be for some reason), and I eliminated it by changing the following line in my project build.gradle.kts file:

kotlin("jvm") version "1.2.71"
to
kotlin("jvm") version "1.2.71" apply false