notes: Here we can see that Period number 83 is the last FIXed Period, but
Period number 84, immediately following, is actually in the OPEN state, and
that is why we cannot fix any Periods now. Only a Period that is CLOSED and
that follows immediately after the last FIXed Period can be FIXed.
Therefore, we will now CLOSE Period 84 for January 2008, and once we have
done that, we should be able to fix up to and including Period number 86,
because we can see that Periods 85 and 86 are already CLOSED.