func NewGroup() *Group {
	in := make(chan Message)
	close := make(chan bool)
	return &Group{in: in, close: close, clock: 0}
}
func NewGroup() *Group {
	in := make(chan Message)
	close := make(chan bool)
	return &Group{in: in, close: close, clock: 0}
}
func NewGroup ( ) * Group { in := make ( chan Message ) close := make ( chan bool ) return & Group { in : in , close : close , clock : 0 } }
// NewGroup creates a new broadcast group.
NewGroup creates a new broadcast group .