fun crossant do
  if true then
    turn right;
    move else turn left; moven done;
    turn left;
    turn left;
    moven;
    turn right;
  else
    moven;
  done;
done;
flip 2 turn left else turn right done;
while true do
  crossant();
  crossant();
  crossant();
  crossant();
  crossant();
  crossant();
  flip 2 turn right else turn left done
done