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level difference
In fandoms where creatures have well-defined "evolutionary" levels, such as pokémon and digimon, this tag is used for images were several of these levels are pictured interacting.
This does not apply if they are in a lineup of very many different such creatures, or in different subpictures of a post containing multiple_images, etc.
Examples:
pokémon:
post #693422
digimon:
post #670794
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