/**
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Overview
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Source
Overview
Classes
Sunnysideup\CampaignMonitor\Tasks
CampaignMonitorSyncAllMembers
getExistingFolkListed
Introduction
Synopsis
Source
Sunnysideup\CampaignMonitor\Tasks\CampaignMonitorSyncAllMembers::
getExistingFolkListed
updates the previouslyExported variable.
Signature
private function getExistingFolkListed()