niirɛnɩ̰́ɩ̰rɛnɛanether grindstone, a large flat granite stone on which grain is ground. Two such stones, one for coarse grinding and one for smooth, are fitted onto a large cylindrical mud base.niirɛ boko.hole behind the grindstone (away from the grinder), to receive the flour as it is ground.synbageregaɛberega
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