Potential answers for "Image-sharpening groups (Abbr.)"

⭐⭐⭐⭐ PRFIRMS
⭐⭐ OILSTONE
⭐⭐ PTAS
⭐⭐ BLUNTKNIFE
⭐⭐ BLUNT
⭐⭐ GRINDSTONE
⭐⭐ DULLKNIFE
⭐⭐ BLUR

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