using System;

using System.Collections.Generic;

public class Program {

    public static void Main() {

        string[][] inputs = new string[9][] {

            new string[3] { "aba", "bbb", "bab" },                              // False

            new string[3] { "ab",  "bb",  "aa"  },                              // True

            new string[2] { "q", "q" },                                         // False

            new string[3] { "zzzzab",  "zzzzbb",  "zzzzaa" },                   // True

            new string[4] { "ab",  "ad",  "ef",  "eg" },                        // False

            new string[6] { "abc",   "bef",   "bcc",  "bec",  "bbc",  "bdc" },  // True

            new string[4] { "abc",  "abx", "axx",  "abc"    },                  // False

            new string[4] { "f",  "g",  "a",  "h"   },                          // True

            new string[6] { "abc", "bef", "bcc", "bec", "bbc", "bdc" },         // True

        };

        int i = 1;

        foreach (string[] input in inputs)

            Console.WriteLine(i++ + ": " + stringsRearrangement(input));

    }

    static bool stringsRearrangement(string[] inputArray) {         

        int n_s = inputArray.Length;        // Number of Strings

        int n_c = inputArray[0].Length;     // Number of Chars per String

        bool[,] matches = new bool[n_s, n_s];

        int[] n_matches = new int[n_s];

        for (int i = 0; i < n_s - 1; i++) {

            int n_match = 0; 

            for (int j = i + 1; j < n_s; j++) {

                bool match = false;

                for (int k = 0; k < n_c; k++) {

                    if (inputArray[i][k] != inputArray[j][k]) {

                        if (match) {

                            match = false;

                            break;

                        }

                        match = true;

                    }

                }

                matches[i, j] = match;

                //Console.WriteLine("i: " + i + ", j: " + j + " - " + match);

                if (match)

                    n_match++;

            }

            if (n_match == 0)

                return false;

        }

        return true;

    }       

}