I have recently found out that the pronoun "all" can be declined either as "allen" or "alles" in masculine and neuter forms in genitive singular.
When looking at the declension table for "ALL", "alles" and "allen" are written together in the same bracket.
Also, in the link above, the term "allen" (mistyped as jeden) is said to be used after nouns in genitive that end with s\es. However I can't decide whether the information is correct or not, giving the writer mistyped allen as jeden.
My question is, in which way does "allen" differ from "alles"?
Does "allen" accompany nouns with specific terminations only?