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https://activities.scolab.com/#!/curriculum/QCRVO106/grade/all-grades/subject/arithmetic-and-algebra
uBlock logs when using EasyList filter : https://screenshots.scolab.com/Public/J ... -50-39.png
Problematic images are stored at d1m9xsywzv0elf.cloudfront.net, under the folder "ad". It was not intentional to use the name "ad", simply the result of a a naming convention using the first two chars of a GUID.
I am not familiar with the filter syntax, but I've found a similar pattern in the current list
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@@||d17lvj5xn8sco6.cloudfront.net/ad/$image,xmlhttprequest