...,
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    "a":"55CBA8103185","b":"55CB9AE1E000","o":"D2E5185",
    "s":"boost::assertion_failed(char const*, char const*, char const*, long)","s ":"65"
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    "s":"boost::optional<mongo::BucketUnpacker>::operator*() &","s ":"15"
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{
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    "s":"mongo::(anonymous namespace)::createRandomCursorExecutor(mongo::CollectionPtr const&, boost::intrusive_ptr<mongo::ExpressionContext> const&, long long, long long, boost::optional<mongo::BucketUnpacker>)","s ":"A0A"
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    "s":"mongo::PipelineD::buildInnerQueryExecutorSample(mongo::DocumentSourceSample*, mongo::DocumentSourceInternalUnpackBucket*, mongo::CollectionPtr const&, mongo::Pipeline*)","s ":"276"
},
{
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},
{
    "a":"55CBA4443A50","b":"55CB9AE1E000","o":"9625A50",
    "s":"mongo::runAggregate(mongo::OperationContext*, mongo::NamespaceString const&, mongo::AggregateCommandRequest const&, mongo::LiteParsedPipeline const&, mongo::BSONObj const&, std::vector<mongo::Privilege, std::allocator<mongo::Privilege> > const&, mongo::rpc::ReplyBuilderInterface*)","s ":"1DB0"
},
{
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    "s":"mongo::(anonymous namespace)::PipelineCommand::Invocation::run(mongo::OperationContext*, mongo::rpc::ReplyBuilderInterface*)","s ":"E5"
},
{
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    "s":"mongo::CommandHelpers::runCommandInvocation(mongo::OperationContext*, mongo::OpMsgRequest const&, mongo::CommandInvocation*, mongo::rpc::ReplyBuilderInterface*)","s ":"D3"
},
{
    "a":"55CBA5BB8A65","b":"55CB9AE1E000","o":"AD9AA65",
    "s":"_ZZN5mongo14CommandHelpers20runCommandInvocationESt10shared_ptrINS_23RequestExecutionContextEES1_INS_17CommandInvocationEENS_9transport15ServiceExecutor14ThreadingModelEENK3$_0clEv","s ":"35"
},