No, I think it is very clearly saying:
POW=A1/(A2a+A2b+A2c+A2d)/A3/A4/A5/A6/B1/B2
Where '/' is 'or' and '+' is 'and'. However, I admit to only reading it for grammar, not for content, so I do not know if it makes it clear in the content of any of those that there are no '+'. But I did read...