[see also: away]
the set of points with $\langle$at$\rangle$ distance 1 from $K$
the set of points at a distance less than 1 from $K$
Hence $A$ and $B$ are at distance precisely $d$.
Consider a pair of points $a$, $b$ at distance 1.
The point $p$ is within distance $d$ of $X$.
Their centres are a distance at least $N$ apart.
Any point not in $B$ is moved by $f$ a distance equal to twice the distance to $M$.
If we stay a fixed distance off the critical line, we do not expect Benford behaviour.
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