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I have an array of nested objects:
[
{_id:1, parent:0, name:'Z'},
{_id:4, parent:0, name:'A'},
{_id:2, parent:1, name:'H'},
{_id:8, parent:2, name:'G'},
{_id:5, parent:4, name:'M'},
{_id:6, parent:4, name:'N'},
{_id:3, parent:1, name:'Z'},
{_id:7, pare...