int total_s=turtle.length();
for(int i=2;i<startAt.size();)
total_s+=startAt.getSubNode(i++, qt).getBytes().length();
Bytes acc=new Bytes(total_s);
int pc=0;
acc.poke_bytes(pc,turtle);
for(int i=2;i<startAt.size();){
pc+=turtle.length();
turtle=startAt.getSubNode(i++, qt).getBytes();
acc.poke_bytes(pc,turtle);
}