Title: ABT kernel for the n-queens problem (SIES - old interface)
Author: Ionel Muscalagiu
Description:
This is the N-Queens problem solution using ABT kernel as outlined in :

• C. Bessiere, I. Brito, A. Maestre, P. Meseguer. Asynchronous Backtracking without Adding Links: A New Member in the ABT Family
  Artificial Intelligence, volume 161, pages 7-24.

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