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{
identifier: 'id',
label: 'name',
items: [
{ id: '0', name:'Foods', numberOfItems:1, children:[ {_reference: '1'}, {_reference: '2'}, {_reference: '3'} ] },
{ id: '1', name:'Fruits', numberOfItems:1, children:[ {_reference: '4'} ] },
{ id: '4',name:'Citrus', numberOfItems:1, items:[ {_reference: '5'} ] },
{ id: '5', name:'Orange'},
{ id: '2', name:'Vegetables', numberOfItems:0},
{ id: '3', name:'Cereals', numberOfItems:0}
]
}
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