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Features- Size: Approx

Empty refillable tanks before flying to avoid leaks caused by cabin pressure changes

The cylindrical design offers greater resistance to damage during handling, packaging, and transportation

We break exact linear dependency between the three explanatory variables (i.e., cohort = period age) and deal with under-identification by grouping birth cohorts into frequently used 5-year intervals, and, after confirmation of a curvilinear relationship, treat smoking as a quadratic function of age 30