#no update for variables
{
init
	node first; true
	[ 
	error||tran after; z>=4; z=0; 1.0
	]
	[
	error||tran before; z<4; z=0; 1.0
	] 
}
{
	node after; true
	[
	tran after;true;null;1
	]
}
{
	node before; true
	[
	tran before;true;null;1
	]
*