"Historian's opinion" is true only when considering...but not when considering...
  • Body P 1 = True
  • Body P 2 = True (historiography)
  • Body P 3 = False
  • Body P 4 = False (historiography)

This factor is necessary when explaining...but not sufficient to...
  • Body P 1 = Why Necessary (why is this factor important?)
  • Body P 2 = Why Necessary (why is this factor important)
  • Body P 3 = Why Not Sufficient (what other factors also contributed?)
  • Body P 4 = Why Not Sufficient (what other factors also contributed?)