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The second pt.xpt dataset shows testing for just one constituent, product moisture, performed in three replicates (note the values of PTREPNUM), at the first three time points of the study (as shown in PTTPT / PTTPTNUM), from two sets of storage conditions (STOCONID), in samples of both dried and as-is tobacco (PTSPEC, PTSPCCND) in order to illustrate how those variables are used to represent their associated concepts in a stability study. 

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