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from CommonTools.RecoAlgos.trackingParticleConversionRefSelectorDefault_cfi import trackingParticleConversionRefSelectorDefault as _trackingParticleConversionRefSelectorDefault
trackingParticleConversionRefSelector = _trackingParticleConversionRefSelectorDefault.clone()

from Configuration.ProcessModifiers.premix_stage2_cff import premix_stage2
premix_stage2.toModify(trackingParticleConversionRefSelector, src = "mixData:MergedTrackTruth")