<https://forums.slipstick.com/threads/90180-from-a-nested-contact-folder-structure-to-a-categorised-contact-structure/>
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"From a Nested Contact Folder Structure to a Categorised Contact Structure"
<https://forums.slipstick.com/threads/90180-from-a-nested-contact-folder-structure-to-a-categorised-contact-structure/>