Correctly distinguish between parent policy group and child policy group

Correctly identifying the mother strategy group will help a lot to understand the logic of the Russian doll

Method

Except for DIRECT and REJECT, the reason is: Loon has built-in DIRECT and REJECT strategy groups, so it is impossible to have a strategy named DIRECT or REJECT in the Strategy Group panel group
A strategy group named DIRECT or REJECT with a special font can appear, for example a strategy group named 𝐃𝐈𝐑𝐄𝐂𝐓
Subscription rules can only select a strategy group as a parent strategy group, not a child strategy group, but the parent strategy group is nested in other parent strategy groups to become a child strategy group' Outside the case

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