GPSS multiple fork

generate 10
queue line
transfer 0.9,A,B
A seize insa
  depart line
  advance 6,2
  release insa
  transfer 0.1,Aacc,Arej

B seize insb
  depart line
  advance 10,2
  release insb
  transfer 0.1,Bacc,Brej

Aacc terminate 1
Arej terminate 1
Bacc terminate 1
Brej terminate 1

Start 100