IKH Synchronizer Start P2S3-3
Synchronize	IKH Start P2S4-3
In 1
In 2
In 3
In 4
Out 1	IKH Role1 Do something P2S4-3
Out 2	IKH Role2 Do something P2S4-3
Out 3
Out 4
Snapshot	Yes
Tag	Start

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Synchronizer model.