What did Twain say was his only regret after writing about the murder in the town?

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Explanation:

At last, the day of Muff Potter's trial arrives. It is the sole absorbing story of the entire town. Every report about the trial makes Tom shudder, and he finds Huck Finn in order to reassure himself that Huck has told no one. Huck tells Tom that he will tell only when he decides that he wants Injun Joe to drown him, for he knows that they will not be alive for two days if they reveal what they know. The boys then swear again not to reveal the truth because the consequences of their telling would be tantamount to their own deaths.