surprising [to me and students] printer behavior with #:transparent

Hi all,

In my course here on campus, I have students use #lang racket and we put
#:transparent on our struct definitions for easier REPL interactions.  A
student was confused by the different printer-behavior between a and b in
the attached screenshot, and I can't think of a reason for the different
behavior for b compared to a and c either.  Curious if there /is/ a decent
reason or if this is just one of those glitches.

"No big deal" but worth asking...

[image: Inline image 1]

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