[NTG-context] Math Cases

Is it possible to number each part of the cases environment. I want \startformula a = \cases{ b, & \text{ if something} \cr c, & \text{ if something else} \cr} \stopformula to come out as { b if something (1) a = { { c if something else (2) Also, is it possible to have subnumbered equations, that is can I get (1a) and (1b) instead of (1) and (2). Thanks, Aditya -- Aditya Mahajan, EECS Systems, University of Michigan http://www.eecs.umich.edu/~adityam || Ph: 7342624008