League and round-robin fixtures for 10 and 12 teams

Combining 10 and 12 teams

 

The table below shows teams in a division of 10 which have fixtures opposite teams in a division of 12

10 team 12 team
   
1 7,12
2 8
3 9
4 10
5 11
6 3
7 4
8 5
9 6
10 1,2