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fix version in compose placement pref example (#6569)
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@ -646,7 +646,7 @@ in the [swarm](/engine/swarm/) topics.)
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Specify placement of constraints and preferences. See the docker service create documentation for a full description of the syntax and available types of [constraints](/engine/reference/commandline/service_create.md#specify-service-constraints-constraint) and [preferences](/engine/reference/commandline/service_create.md#specify-service-placement-preferences-placement-pref).
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version: '3'
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version: '3.3'
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services:
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db:
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image: postgres
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