snort variable to specify 2 networks and exclude one IP inside the network - How?

["Simon Yip" <simon388 () netvigator com>]

Hello

Suppose I have the variable HOME_NET= [155.200.2.0/24,155.200.3.0/24] and I would like o specify in a rule to specify 
the host of HOME_NET exclude the IP=155.200.2.10
Anyone knows the expression using the $HOME_NET and the above IP?  Thanks

Simon