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This document discusses the N Queen problem, where the goal is to place N queens on an N×N chessboard so that no two queens attack each other. Backtracking is an algorithmic technique for solving problems recursively by trying to build a solution incrementally, abandoning a solution ("backtracking") as soon as it is determined that the solution cannot possibly be completed to a valid one. The document likely provides an explanation and example of using a backtracking algorithm to solve the N Queen problem.