Kiang used in a sentence

Kiang in a sentence as a noun

I know that biang is the name of a particular noodle; I'm not aware of kiang; and I believe that duang is a sound Jackie Chan made once. Which leads into a tangential question -- "duang" has no meaning.

So by your definition, are "biang", "kiang" and "duang" valid pinyin, considering those are pronounceable and understandable to millions of people, though they don't appear in your table?