= Solution
\b[No: with one pair per stratum, the statistic uses failure order but discards the size of the time difference.] The <paired log-rank reduction to a sign test> assigns the same contribution when A fails just before B as when A fails much earlier. This deliberately avoids a model for the failure-time distances, but it does not extract every kind of evidence in the recorded times. An <accelerated failure time model>, for example, could use log-time differences in uncensored pairs under additional distributional assumptions.
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