cannot self-delete posts?

[voynich]

is there a reason why, in many other sections of these boards, one can delete their own posts, but not here in general? it is interesting and curious. i would think it would be a general (intended pun) rule for the entire board, not per forum.
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the voynich manuscript is a mysterious illustrated book written in an indecipherable text. it is thought to have been written between 1450 and 1520. the author, script and language of the manuscript remain unknown.