organic chemistry - Dehydrobromination of 3-bromo-3-cyclopentylhexane and number of possible alkene products

I faced a question like this:

The total number of alkene products possible from the dehydrobromination of 3-bromo-3-cyclopentylhexane is:

The answer is given 5. But I only found 3.

1. 3-cyclopentylhex-2-ene


2. 3-cyclopentylhex-3-ene


3. (hexan-3-ylidene)cyclopentane

I can't find the other 2. Any hint?

Answer

The structures (i) and (ii) have two isomers each,namely E and Z isomers.

For the structure (iii) there is a plane of symmetry (marked in the diagram) so it is not a geometrical isomer.

Thus Number of isomers=2 (of structure i) +2 (of structure ii) + 1(of structure iii)= 5 isomers