This is a diff between 1.1 and 1.2 revisions:

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< ---+++ Simple Replication Clustering with Single-Server Virtuoso instances
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> ---+++ Replication Clustering with Single-Server Virtuoso instances
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< degree of load balancing -- but the downstream subscribers (commonly called "slaves")
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> degree of load balancing and high availability -- but the downstream subscribers (commonly called "slaves")