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Use "half-width" in a sentence
"This is my "for public consumption" bookcase (actually two bookcases as I had a little room to add the half-width case on the left)."
"After coating the rim with a thin layer of glue and letting it dry, smear glue down one side of your half-width strip of old base tape, and stick it down the center of the rim channel."
"Flag description: three horizontal bands of maroon (top), white (half-width), and maroon"