S1: Machines have parts made of iron.
P: They must be painted or chrome plated.
Q: Some parts rub against each other.
R: Iron gets rusted.
S: They must be lubricated with oil or grease.
S6: When the machine is not in use, it should be covered.
The Proper sequence should be:
A. PRQS
B. QRPS
C. QSRP
D. RPQS
Answer: Option D

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