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# Author Problem Lang Verdict Time Memory Sent Judged  
104614811 Practice:
pranav232323
1430C - 6 Java 8 Time limit exceeded on test 2 2000 ms 0 KB 2021-01-17 22:33:24 2021-01-17 22:33:24
→ Source
//package com.codeforces.EducationalRound96;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Div2C {

    static class FastReader {

        BufferedReader  br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                }
                catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            }
            catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }

    public static void main(String[] args) {

        FastReader s = new FastReader();

        long n;

        long curr;

        int T = s.nextInt();

        for (int i = 0; i < T; i++) {

            n = s.nextInt();

            System.out.println(2);

            System.out.printf("%d %d\n", n, n - 1);

            curr = n;

            for (long j = n - 2; j >= 1; j--) {
                System.out.printf("%d %d\n", curr, j);
                curr =
                    ((curr + j) % 2) == 0 ?
                    ((curr + j) / 2) :
                    ((curr + j) / 2) + 1;
            }
        }
    }
}
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