How to get all languages tied to a fallback language

This article contains the code segment that can retrieve all languages tied to a fallback language configured in the cms.

ContentLanguageSettingsHandler.Instance.Get(ContentReference.StartPage).Where(s => s.LanguageBranchFallback.Contains("de", StringComparer.OrdinalIgnoreCase)).Select(s => s.LanguageBranch);

The first parameter in the Contains will be changed to the fallback language of interest.