#no update for variables
{
init
	node first; true
	[ 
	rec_ack12||tran second; true; null; 1.0
	]
	[ 
	snd_ack12||tran second; true; null; 1.0
	]
	[ 
	rec_ack21||tran second; true; null; 1.0
	]
	[ 
	snd_ack21||tran second; true; null; 1.0
	]
}
{
	node second; true
	[ 
	rec_ack12||tran after; z>6000; z=0; 1.0
	]
	[ 
	snd_ack12||tran after; z>6000; z=0; 1.0
	]
	[
	rec_ack12||tran before; z<=6000; z=0; 1.0
	] 
	[
	snd_ack12||tran before; z<=6000; z=0; 1.0
	] 
	[ 
	rec_ack21||tran after; z>6000; z=0; 1.0
	]
	[ 
	snd_ack21||tran after; z>6000; z=0; 1.0
	]
	[
	rec_ack21||tran before; z<=6000; z=0; 1.0
	] 
	[
	snd_ack21||tran before; z<=6000; z=0; 1.0
	] 
}
{
	node after; true
	[ 
	tran after;true;null;1
	]
}
{
	node before; true
	[
	tran before;true;null;1
	]
*