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ServiceUnitStateMachineAlreadyAssigned, ServiceStateNameInUse,
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BadDescriptor, BadServiceStateName, NoUnusedMachines,
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ServiceUnitDebugAlreadyEnabled, ServiceUnitResolvedAlreadyEnabled,
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from juju.state.charm import CharmStateManager
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from juju.state.relation import ServiceRelationState, RelationStateManager
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from juju.state.machine import _public_machine_id, MachineState