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Re Mind Screw - what makes you say that Corcoran and Ralph are so far apart in age? It's entirely possible that they're both, say, late 30s - after all, the whole point is that Corcoran is Captain not because he's a senior sailor but because he was born middle-class. Josephine could easily be in her late teens, if Corcoran married young.
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How well does it match the trope?