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a: flake scar on OPT 3; b, c: pits on OPT 1 and 21; d: linear impressions on OSA 5; e: linear impressions and striations on OSA 15; f: smoothed areas on OPT 9; g-i: smoothed areas and microstriations on OPT 3, 11 and 13 respectively; j: deep grooves on OPT 20. Scales = 5 mm.
