A shibboleth noted in the NYT

[Wilson Gray]

"Survivors at a displaced-persons camp in a United Nations compound in Juba
spoke of mass arrests and _impromptu language tests_ being given by
security forces to determine which ethnic group [Dinka or Nuer] people came
from — an exchange they said could determine life or death."

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The American Dialect Society - http://www.americandialect.org