I am using 1520 tank for my film developing. Its capacity says:

2 rolls of 35mm
2 rolls of 120
1 roll of 220

I can understand 35mm and 220 but I could not figure out how to load 2 rolls of 120 film on it.

2 reels of 120 does not fit.

should I load 2 rolls of film to same reel?