This is very similar to question 22. I thought I had to brute force it. But then I remembered the four special configurations:
Answers C and D reverse one of these configurations. Reversing a special configuration makes it harder to obey the rules.
I drew C first, but it was possible:
D doesn’t work, so it’s CORRECT. If you draw UT first, then there’s no way to do ST or SU:
I’ll repeat the rationale for trying C and D first. We need ST or SU. So taking two of those letters and putting them out of order (UT) greatly restricts our options for placing ST or SU.
These diagrams prove that A, B and E are possible:
Note that A and B use SU and TM. Those are two of the four special configurations. So these answers make it easier to satisfy the rules. They were poor candidates.
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