function x(input) {
  let k = input[0];
  let l = input[1];
  let m = input[2];
  let n = input[3];

  let counterValid = 0;
  for (i = k; i <= 8 && counterValid != 6; i++) {
    if (i % 2 != 0) {
      continue;
    }

    for (j = 9; j >= l && counterValid != 6; j--) {
      if (j % 2 == 0) {
        continue;
      }
      let sum = Number(i + `${j} `);

      for (y = m; y <= 8 && counterValid != 6; y++) {
        if (y % 2 != 0) {
          continue;
        }

        for (z = 9; z >= n; z--) {
          if (z % 2 == 0) {
            continue;
          }
          let sum2 = Number(y + `${z} `);

          if (sum == sum2) {
            console.log(`Cannot change the same player.`);
          } else {
            counterValid++;



            console.log(`${sum} - ${sum2}`);

            if(counterValid == 6){
                break
            }

          }
        }
      }
    }
  }
}

x(["6", "7", "5", "6"]);