GO FRONTIER was 1,235 of the rung-10 run's macro starts in 47 minutes, over two museum floors
and a town whose ground the fly had already covered. The tiles it aimed at were real and
unreachable: 98 walkable tiles on the museum's ground floor, 62 of them reachable from the door,
39 never stood on and almost all of those behind the admission desk. A walk that can reach none
of its goals refuses no route and writes every goal to the blocked ledger -- which is a ten
brain minute window, so all of it came back and the refusal happened again, once per hold.
A window is right for a target somebody is standing in front of and wrong for ground the map has
fenced off. So the refusal is remembered per map instead, with no window, and it is cleared by
the one event that can change the answer: the fly standing somewhere on that map it had not
stood on before -- a door opened, a script carried it through, somebody moved out of a doorway.
Re-entering the map clears nothing, which is the loop the window made.
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