Four guys walk into a bar in a Midwestern city, and the bartender asks, "What'll you guys have dis afternoon?" They look at each other and nod, and then one of them says, "Gimme t'ree Stroh fuh ma frien's, an' I'll have a Heinekens."
There's triolet, which comes via French, but otherwise I think trees are ruled out. It's hard to find a pattern in trigon/trigonometry & trivet/tripod, though.
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