##no update for variables
{
init
	node s0; x2<=0
	[ 
	snd_idle21||tran  s2; x2=0; null ; 0.5
	snd_idle21||tran  s3; x2=0; null ; 0.5
	 ] 
	[ 
	rec_idle12||tran  s1; x2=0; null ; 1
	 ] 
}
{
	node s1; x2<=0
	[ 
	snd_idle21||tran  s4; x2=0; null ; 0.5
	snd_idle21||tran  s5; x2=0; null ; 0.5
	 ] 
	[ 
	rec_req12||tran  s0; x2=0; null ; 1
	 ] 
}
{
	node s2; x2<=850
	[ 
	rec_idle12||tran  s4; true; null ; 1
	 ] 
	[ 
	snd_ack21||tran  s7; x2>=760; x2=0 ; 1
	 ] 
}
{
	node s3; x2<=1670
	[ 
	rec_idle12||tran  s5; true; null ; 1
	 ] 
	[ 
	snd_ack21||tran  s7; x2>=1590; x2=0 ; 1
	 ] 
}
{
	node s4; x2<=850
	[ 
	rec_req12||tran  s2; true; null ; 1
	 ] 
	[ 
	snd_req21||tran  s6; x2>=760; x2=0 ; 1
	 ] 
}
{
	node s5; x2<=1670
	[ 
	rec_req12||tran  s3; true; null ; 1
	 ] 
	[ 
	snd_req21||tran  s6; x2>=1590; x2=0 ; 1
	 ] 
}
{
	node s6; true
	[ 
	rec_req12||tran  s0; true; x2=0 ; 1
	 ] 
	[ 
	rec_ack12||tran s8; true; x2=0 ; 1
	 ] 
}
{
	node s7; true
	[ 
	loop||tran s7; true; null; 1.0
	 ] 
}
{
	node s8; true
	[
	loop||tran s8; true; null; 1.0
	]
*