namespace Sticks
{
    using System;
    using System.Collections.Generic;

    public class Program
    {
        static Tuple<int, int>[] frames;
        static SortedSet<string> allPermutations = new SortedSet<string>();

        public static void Main()
        {
            ReadFrames();
            GeneratePermutations(0);
            PrintPermutations();
        }

        private static void ReadFrames()
        {
            int n = int.Parse(Console.ReadLine());
            frames = new Tuple<int, int>[n];
            for (int i = 0; i < n; i++)
            {
                string frameSizes = Console.ReadLine();
                string[] sizes = frameSizes.Split(' ');
                int width = int.Parse(sizes[0]);
                int heigth = int.Parse(sizes[1]);
                frames[i] = new Tuple<int, int>(width, heigth);
            }
        }

        static void GeneratePermutations(int k)
        {
            if (k == frames.Length)
            {
                string permutation = String.Join(" | ", (object[])frames);
                allPermutations.Add(permutation);
            }
            else
            {
                for (int i = k; i < frames.Length; i++)
                {
                    SwapFrames(k, i);
                    GeneratePermutations(k + 1);
                    FlipFrame(k);
                    GeneratePermutations(k + 1);
                    FlipFrame(k);
                    SwapFrames(k, i);
                }
            }
        }

        static void FlipFrame(int k)
        {
            frames[k] = new Tuple<int, int>(frames[k].Item2, frames[k].Item1);
        }

        static void SwapFrames(int k, int i)
        {
            var oldFrame = frames[i];
            frames[i] = frames[k];
            frames[k] = oldFrame;
        }

        static void PrintPermutations()
        {
            Console.WriteLine(allPermutations.Count);
            foreach (var perm in allPermutations)
            {
                Console.WriteLine(perm);
            }
        }
    }

}