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Anti-aliasing is not allowed.

Though there are exceptions: if it is used purely for the purpose of making a shape/image look less jaggier and it is not obvious, then it is allowed. 

Examples of ok:

Examples of not-ok: 

(both on the right are not ok)

But just to be safe, try avoid using anti-aliasing if you can.

Hi, you will be able to use anti-aliasing now regarding the rule change on 28/3/21