This question is good practice for making deductions. It places R first. This in turn leads to a massive chain of deductions that affects every variable. The deductions are about ordering, so I’m going to go step by step to create a sequencing diagram that applies to this question.
Let’s go step by step. Rule 2 says that R + S are either both before or both after T. If R is first, then R + S must both before T:
Rule 1 says that V also comes after S:
Rule 3 is affected too. W has to be before or after both R and T. Since R is first, then both R and T are before W. So we can add W after T on the diagram:
There are only four open spaces for these four variables. Since S has to be in front of all the other remaining variables, S has to be second.
We can draw the full diagram like this:
This diagram shows us the rules that govern V, T and W. T is somewhere before W, and V could go anywhere.
You can use this framework to eliminate answers. The diagram above contradicts A, C, D and E.
B is CORRECT. This diagram proves that it’s possible:
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