Under the current schedule, this means an additional options contract will be listed on the differential between the January 2005 and January 2006 contracts.
Other spread combinations currently listed, include a similar spread for December–to–December; 24 consecutive one-month spreads; spreads between the first and third nearby months, the first and fourth nearby months, and the second and fourth nearby months; and spreads between June/December, December/June, April/October, and October/April.