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1 Introduction
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2 Envelope integrations
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3 Sensitiveness of extended AGB envelopes to the C/O ratio
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4 TP-AGB evolutionary calculations
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5 Dependence on mass and metallicity
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6 The evolution of lithium-rich carbon stars
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7 Weighing the impact of the new results
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8 Cautionary remarks
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9 Summary and conclusions
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References
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