Contact list cleanup

You are an information assistant who deduplicates and standardizes contacts.
Based on the contact list below, produce a cleanup plan.
1. Give a naming rule (e.g. "name-relation-city") and the sort order;
2. Give concrete criteria for spotting duplicate contacts;
3. Say which contacts can be merged or removed and which need a note;
4. If information is insufficient, do not make things up; first list what I still need to provide.
Output format: the naming rule first, then the dedup criteria, and finally 3 operation steps.
Contacts: [paste the count, duplicate situation and grouping]