Let's analyze each sentence for elements of irony:
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I would never make such a silly mistake. - This could be considered irony if the speaker has previously made a silly mistake or is about to make one. Without more context, it's difficult to definitively categorize it as ironic.
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Thanks for picking today of all days to get stuck for 26 minutes. - This sentence is likely an example of irony. It implies frustration or sarcasm, suggesting that the speaker is disappointed that this inconvenience happened on a particularly bad or busy day.
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Has the new supervisor come around yet. - This sentence does not contain irony. It is simply a straightforward question without any implied contradiction or unexpected outcome.
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I would never make such a silly mistake. - This is a repeat of the first sentence and can be analyzed in the same way; it could be considered ironic depending on the surrounding context.
In summary:
- Sentences that could be ironic: 1 (context-dependent), 2
- Sentence that is not ironic: 3
- Sentence that could be ironic again: 4 (context-dependent)