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Handy tip #1: You can type this syntax to put an attachment by number in your post:
[att=nnnn]nnnn[/att]​
where nnnn is the post number.

Handy tip #2: If you try your own member number (just the first 5 digits if it's 6 digits long), you will obviously get an image that reveals something about you in particular.

Me:
[att=12149]12149[/att]

12149
Hey, it works! That's my family tree!
 
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