But I already told you that
Don't believe that because you've already told somebody something once that they're going to have remembered every detail.
It's likely that their focus when they asked you was totally different to your point of view.
They would have automatically dropped info that wasn't relevant to their current focus and retained the information that was - especially if they're time-bound, stressed, or trying to understand something that's completely new to them.
So don't get annoyed if they ask the same questions again as they may have a different focus this time and will absorb different pieces of information.
If you really don't want to have to repeat yourself, spend more time documenting your knowledge so it can be shared with others.
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