Answers are grounded in this paper and cite their sources.
Ausdrucksverstärkung; Untersuchungen zur etymologischen Verstärkung und zum Gebrauch der Steigerungsadverbia im Balto-Slavischen und in anderen indogermanischen Sprachen. Pp. viii + 156. By Erich Hofmann. Göttingen: Vandenhoeck und Ruprecht, 1930. - Volume 6 Issue 4-Part1
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Frederic T. Wood (1930) studied this question.
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