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This is a PARALLEL SYMMETRY about the destruction of the Canaanites:
1) The CONJUGATE PAIR, B-B′, identifies that the LORD kept His end of the agreement, that the Canaanites were delivered.
2) The LAST/LAST emphasis, C-C′, reveals the importance of a vow: the people of Israel kept their end of the agreement for they utterly destroyed their cities.
3) The CONCLUDING SUMMARY requires some footnotes to identify that the word Hormah means destruction.