#11 break one sequence into several

[Anonymous]

The code should be able to limit the number of objects on one screen and break a big sequence into smaller ones.
So, if you're given:

a {
b {
c { d; }
}
e {
f {g;}
}
}

The code should be able to generate one picture with a,b,e and another two with b,c,d and e,f,g.