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—applied as being a purpose term ahead of an appropriate noun to distinguish the issue on the referent from the standard, former, or hypothetical issueWithin the Global Phonetic Alphabet, ⟨a⟩ is useful for the open entrance unrounded vowel, ⟨ä⟩ is utilized for the open central unrounded vowel, and ⟨ɑ⟩ is useful for the open back unr