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==Extensions==
Using Skeen's original three-phase commit protocol, it is possible that a quorum becomes connected without being able to make progress (this is not a deadlock situation; the system will still progress if the network partitioning is resolved). Keidar and Dolev's E3PC<ref name=E3PC>{{cite journal|last=Keidar|first=Idit|author2=Danny Dolev |title=Increasing the Resilience of Distributed and Replicated Database Systems|journal= Journal of Computer and System Sciences|volume=57|issue=3|date=December 1998|pages=309–324|
url=http://webee.technion.ac.il/~idish/Abstracts/jcss.html|doi=10.1006/jcss.1998.1566|doi-access=free}}</ref> refines Skeen's three-phase commit protocol and solves this problem in a way which *always* allows a quorum to make progress.
==Disadvantages==
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