{
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{
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{
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}
],
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},
{
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{
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}
],
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}
],
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{
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{
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}
],
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},
{
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{
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}
],
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}
],
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{
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{
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}
],
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}
],
"operation": "write",
"read_preference": {
"mode": "SecondaryPreferred",
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{
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}
]
},
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{
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],
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{
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],
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{
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{
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}
],
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{
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{
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}
],
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}
],
"type": "Sharded"
}
}