initop :  called from mainline 1
forwarding to fwd1 
fwd1 :  forwarded by initop 2
forwarding to fwd2 
fwd2 :  forwarded by fwd1 3
fwd2 :  forwarded by fwd2 2
fwd2 :  forwarded by fwd2 1
fwd2 :  forwarded by fwd2 0
4
4
20
30
2
3
