Just want to know how to search reference application in appian cloud site which is referenced by which course ?

I found some of explanation in appian Documentation like below ....
(All of Appian's tutorials use the Appian Tutorial application as the reference application.)

And I checked my appian cloud site and i found some reference tutorial application (examples .Human Resources,
Appian Reail,Acme Solution,etc.....)


For exmple Acme Solution reference application is used for tutorial of Appian Developer course and
Appian retail reference application is for build reports from records and i found reference documentation.
docs.appian.com/.../report-with-records.html

My question is some of reference tutorial application in applian cloud site cannot found any reference documentaion
and any reference tutorial course.
As my understand all courses of online courses tutorial have appian reference application in appian cloud site?
It's right ?How can i find those reference application in appian cloud site of reference resources.

Thanks a lot

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