In the context of your question, the sentences you provided can be analyzed for examples of irony as follows:
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"Janelle ran the half block from the subway station to the office." - This sentence is a straightforward statement and does not contain irony.
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"Thanks for picking today of all days to get stuck for twenty six minutes." - This sentence can be seen as ironic because it suggests frustration with a situation that is particularly inconvenient, implying that the speaker finds it absurd that such a delay would happen on an important day.
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"Has the new supervisor come around yet?" - This is a neutral question and does not display irony.
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"I would never make such a silly mistake." - This could be considered ironic if the speaker had indeed made a silly mistake previously or if the context implies that everyone knows the speaker frequently makes silly mistakes.
In summary:
- Irony: "Thanks for picking today of all days to get stuck for twenty six minutes." and possibly "I would never make such a silly mistake." (depending on the context)
- Not Irony: "Janelle ran the half block from the subway station to the office." and "Has the new supervisor come around yet?"