cum_on_food -> food
Not:
rule34.xxx/index.php?page...mp;tags=cum_on_food+-food
coca-cola -> soda
Not:
rule34.xxx/index.php?page...&tags=coca-cola+-soda
pepsi -> soda
Not:
rule34.xxx/index.php?page...list&tags=pepsi+-soda
...
There is a lot more, implications:
* danbooru.donmai.us/tag_implications
* web.media.mit.edu/~stefanm/daboo/tree1.gif
* visuwords.com/wow

Implications are a thing? I guess is your point? Unfortunately the site doesn't have a system in place that takes care of them for us so the only thing we can really do is try to fix them when we notice them.

Also, just as a warning to people, you have to be really careful with implications because sometimes they are not always as cut-and-dry as you first expect. You'd think that every image that contains "pepsi" would contain soda, but that's just not true. A picture of their mascot "pepsiman" would probably warrant a "pepsi" tag, but there may not be any actual soda present in that picture.

Or some idiot furry could just name their goddamned fursona "pepsi", which I actually just encountered just 2 seconds ago, and there was no soda in the picture. Just a heads up to anyone trying to tackle implications to watch out because you don't want to add a bunch of incorrect tags.

Also, I fixed all the implications you mentioned.

Yeah, it is not always 100%, examples of when it is:
* 2girls ---> multiple_girls
* 3girls ---> multiple_girls
* #girls ---> multiple_girls
* multiple_girls ---> female
* dark-skinned_female ---> dark_skin female
* dark-skinned_male ---> dark_skin male

There are lots of images with "girl" tags that don't feature females. This implication will lead to mistagging and will need to be followed up.

Here's one you can do, though some incorrectly tagged images may be among them:

yuri >> female

#girls ---> multiple_girls
and
multiple_girls ---> female
is true most of the time


The definition of "yuri" is "a form of hentai involving two or more females in a homosexual relationship"

Thus, it should really be:
yuri ---> female multiple_girls hentai

We do not use the "hentai" tag.

I sort of didn't think so; however, some images have that tag.

There are many tags that we don't use but still appear on images anyway. It's an ongoing problem.

Is there a list? Else, maybe one should be made.

clothed_female_nude_male ---> clothed female nude male

All unicorns have horns.

What if the horn isn't visible?

post #1439646
post #902281
post #1470780

You don't tag what you can't see.

OK, then it is true 97% of the time; my mistake. 750 images that I added "horn" to from having the tag "unicorn", it is more like 99%

More unicorn+-horn:
post #660561
post #694654
post #694655
post #829921
post #837166
post #845288
post #849255
post #934565
post #934566
post #934567
post #934576
post #987411
post #1091368
post #1091377
post #1186994
post #1186995
post #1236717
post #1317746
post #1379668
post #1439645
post #1440853
post #1562010
post #1657700

Also Princess Luna is sometimes tagged as a unicorn where she is really an alicorn.

dragon_ball_z -> dragon_ball

danbooru.donmai.us/tag_im...n_ball*&commit=Search
en.wikipedia.org/wiki/Category:Dragon_Ball

furry_tail >> fur
furry_ears >> fur
multiple_tails >> tail