How many geometrical isomers are possible for

It should have 8 isomers, but only seven are known
1. All Cl at equatorial (e) position

2. 5e, 1 axial(a)

3.4e,2a

4. 3e,3a

5. 2e,4a

6. le,5a

7. 6a

8. One more is possible.