##Parallel blocks
##parallel besides
##Specify two blocks enclosed in curly braces with no semicolon in-between to lay them out side-by-side.
Left_MN, Left_AR, Server, Right_AR, Right_MN;
{
    Server->Left_AR: Query;
    Left_AR->Left_MN: Query;
    Left_AR<-Left_MN: Response;
    Server<-Left_AR: Response;
} {
    Server->Right_AR: Query;
    Right_AR->Right_MN: Query;
    Right_AR<-Right_MN: Response;
    Server<-Right_AR: Response;
};
box Server--Server: Now I have both;