Only problem is, none of us know what the difference is between: 'O' Tandem and Tandem 'O'. We couldn't find anything in your book.
Only thing I can think of is that in one case you have an 'O' with people acting in tandem, and in the other case, you have two 'O's where half of the people are phantoms. (I'm not saying this very well...)
Can you provide any guidance? Thanks!
A TANDEM "O" would be a formation consisting of 16-spots. I've never seen anyone call this, since there usually aren't 16 dancers in a square. Hence, an additional modifier such as PHANTOM must be added. For example, PHANTOM TANDEM "O". Such nonsense would usually be considered C4.
As for the 3 questions:
I have a pet-peeve problem with the last one, however, as 'Stretch' implies 'Split'. So, if I were calling this instance, I'd say "O" STRETCH COUNTER ROTATE 1/4.