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hm I have few proposals for tags we could delete

underboob, I always tried to figure what is so important to see "under boobs" before you are below waist
cleavage, girls have boobs so they have cleavage... and those who don't are loli ^.-
kitsune, or why don't we have tags like frog, inu, neko for all those animal ears girls?
erect nipples, no idea how to comment this one
cameltoe, imo it is covered by tag pantsu usually
dress, I think if girls are not naked, have seifuku or swimsuit so are 90% of them are in some kind of dress, oh we have kimono tag for 5% of those remaining too

edit: one more tag: pireze