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In relation to metal casting defects, match the following

DefectDescription
$\mathrm{P}$Dross$\mathrm{I}$Shallow blow found on a flat casting surface
$\mathrm{Q}$Scab$\mathrm{II}$Lighter impurities appearing on the top surface of a casting
$\mathrm{R}$Scar$\mathrm{III}$A rough, thin layer of metal, protruding above the casting surface, on top of a thin layer of sand
  1. $\mathrm{P}-\mathrm{II}, \mathrm{Q}-\mathrm{III}, \mathrm{R}-\mathrm{I}$
  2. $\mathrm{P}-\mathrm{II}, \mathrm{Q}-\mathrm{I}, \mathrm{R}-\mathrm{III}$
  3. $\mathrm{P}-\mathrm{III}, \mathrm{Q}-\mathrm{I}, \mathrm{R}-\mathrm{II}$
  4. $\mathrm{P}-\mathrm{III}, \mathrm{Q}-\mathrm{II}, \mathrm{R}-\mathrm{I}$

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