Dear {Name},
You were right and I was wrong.
I never should have questioned your judgment. I thought that {action} was the best course, and in fact you were correct to advocate {action}.
Believe me, I have learned from my mistake. You're an expert in {topic} and I should have deferred to your expertise.
I'm so sorry for the inconvenience caused by my failure to heed your advice.
Sincerely,
{Name}
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