C691 Proof of judgement

After weighting and classifying, it is found that there are only 6 A customers, 16 B customers, 22 C customers, and 13 D customers, with a total of 57 customers, with a total of more than 400 products.

I finally found out why he didn't do it all the time:

The company did not have hundreds of millions of regular Marketing Department doors, they only used advertising clients to find them