What is the difference between the prompts {cow|horse|dog} and [cow|horse|dog]?

[sunhot223]

I know [cow|horse|dog] means step1 draws cow, step2 draws horse, so what does {cow|horse|dog} mean?

[StanleyPain]

I was under the impression that [x] was de-emphasis of the term. The opposite of ().

{x|y|z} is a dynamic prompt syntax. It'll randomly select x y or z when run.

[missionfloyd]

https://github.com/AUTOMATIC1111/stable-diffusion-webui/wiki/Features#alternating-words

[sunhot223]

Understood，thanks a lot for the answer.