WITH the February 28 home ministry directive winding up the Jain Commission probing the controversial Rajiv Gandhi assassination case, the DMK-TMC combine is gearing up to work out a durable formula to back a non-BJP government at the Centre. The two Dravidian parties feel that the climate for working out an arrangement if there is a Congress-led government has already been created. "The decision not to extend the tenure of the Jain Commission must be seen in the light of the judgement given by the designated court in Chennai on January 1998 which sentenced to death the 26 accused in the Rajiv case. It cannot be seen in isolation," says Union minister of state for civil aviation and TMC leader Jayanthi Natarajan.