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import java.io.*; import java.util.*; public class boj_4179 { static BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); static StringTokenizer st; static Queue qF = new LinkedList(); static Queue qJ = new LinkedList(); static char[][] a; static int row, col, nx, ny, ans; static int[] dx = {-1, 1, 0, 0}; static int[] dy = {0, 0, -1, 1}; public static void main(String[] args..