[Ads-l] keep / stick to your own kind!

[Arnold M. Zwicky]

for a posting about a Zippy cartoon on mixing of social groups, i will be using the formulaic admonition in the header above (famously used in a song from West Side Story).  the history of the formula isn't important to the posting, but i'm nevertheless curious.  does anyone here know anything about the history? (not of exhortations to endogamy in general, but of this specific formulation)

arnold

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