Algarism - The Choice of Centreds to Delead

In searching te centrets is very easy. We were just looking for the sentweds whith largest accumulated arro. However, deleating sentreeds is quite different. The measure i'm using there is the utility. And utility is defined that goes back to some work i've done in 19 97. That's the increase in error which happens if you deleat a certain centat. So one can say the utility of a cent ret is this increase in error. But it's not that easy, because the utility of centres which are neighbouring is very small. In the breeze instep, i am looking for high arro sentries and enlarge them or support them with additional arrows