What is "scope", "num" columns in the corpus?

[karmalet]

Hi, may I ask what those "scope", "num" columns stand for?

In "idioms_pretrain.json" ,

idiom num explanation
偃武崇文 0 停息武备，崇尚文教。
洪乔捎书 0 指言而无信的人。
南郭先生 103 比喻无才而占据其位的人。

In "idioms_scopes.tsv",

scope idiom id
Scope I 见义勇为 0
Scope II 偃武崇文 3848
Scope III 亏于一篑 33237

In "idiom_synonyms.tsv",

query synonym query_id synonym_id overlapping
黯然销魂 六神无主 14726 1333 0
黯然销魂 丧魂失魄 14726 2704 1
塞翁失马，焉知非福 塞翁失马，安知非福 24524 32175 8

I thought "overlapping" is related with the number of Chinese character overlapped, but the last one shows 8, which is presumably 7.

Thanks!

[Vimos]

1. num is the frequency of an idiom on the ChengyuCorpus which is released in Two-stage.

2. scope is defined as the following, which is removed from the camera-ready version as Scope III is not used, we will share the definition here.
   
   

3. This is due to the ， is also used to compute overlapping.