Someone said:
If you take 1-2/3-4-5-6,YES!!!
If you take 1/3-4-5-6
2/3-4-5-6 NO!!!
You do NOT HAVE 1/2 coupled.

Let me have a try.

We have runners: 1,2,3,4,5,6
1&2 might come in, but 3,4,5,6 might also to.
I think it's:
1/3, 2,4,5,6
2/3, 1,4,5,6
Yes-No ?

3 is you next favoured runner to come 2nd or 1st,depending.