How to determine the number of stereoisomers of a di-substituted allene, exhibiting both axial and central chirality?

What are the diastereomers and enantiomeric pairs of the compound below where A are chiral groups (central chirality)? There should be [3 diastereomers and 3 enantiomeric pairs](http://www.perekalin.narod.ru/Answers1.pdf) (last page).


[![enter image description here](https://i.stack.imgur.com/pONhm.gif)](https://i.stack.imgur.com/pONhm.gif)


[I previously asked a question about tetra-substituted allenes.](https://chemistry.stackexchange.com/questions/36914/)




These are the three diastereomers with their enantiomers on the right side. The top and middle diastereomers are connected via axial chirality (R and S are used to mark the configuration of A groups).


[![enter image description here](https://i.stack.imgur.com/womKs.gif)](https://i.stack.imgur.com/womKs.gif)


 2

I'm not that good at this but here is something to work on. Each row is a pair of mirror images. Grey structures in 3rd row are identical to the respective 2nd row ones. 
[![enter image description here](https://i.stack.imgur.com/cnuST.png)](https://i.stack.imgur.com/cnuST.png)


 0