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Match the following sand mold casting defects with their respective causes.

$\begin{array}{|l|l|l|l|} \hline \\ {} & \text{Defect} & {} & \text{Cause} \\ \hline P & \text{Blow hole} & 1 & \text{Poor collapsibility} \\ \hline Q & \text{Misrun} & 2  & \text{Mold erosion} \\ \hline R & \text{Hot tearing} & 3 & \text{Poor permeability} \\ \hline S & \text{Wash} & 4 & \text{Insufficient fluidity}  \\ \hline \end{array}$

  1. $P-4, Q-3, R-1, S-2$
  2. $P-3, Q-4, R-2, S-1$
  3. $P-2, Q-4, R-1, S-3$
  4. $P-3, Q-4, R-1, S-2$
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