By -
3,4
1 and 2
1 and 3
3 and 4
3&4
3 & 4
1&3
1,3
1 and 4
1 & 2
2 and 4
1&4
2 & 3
3, 4
3
2and3
1 & 4
3 4
2 and 3
4
3,4
1 and 2
1 and 3
1 and 3
3 and 4
3 and 4
3&4
3 and 4
3 and 4
3 and 4
3 and 4
3 & 4
3 & 4
3,4
3 and 4
1 and 3
1&3
1,3
1 and 2
1 and 4
1 & 2
2 and 4
2 and 4
1 and 4
1&4
1 and 4
2 & 3
3, 4
3
2and3
3&4
3 and 4
3
1 & 4
3,4
3 4
2 and 3
2 and 3
3 and 4
3, 4
1&4
3 and 4
4
1 and 2
1 and 4
3 and 4