OK, let's say that this year (2010) = '10'
So, if you think both frontons will implement this year, your guess would be 10 + 10 = 20.
If you think one will be in 2011 and one will be 2012, your guess would be 11 + 12 = 23.
If you think 'never' for either or both, just put in 99. You can indicate which fronton is which, if you like.
(maybe my grandson will be here to tabulate the results