Rung 10 spent five and a half hours in Pewter City with the objective two doors away, and the
fly kept ending up inside the museum, where GO OBJECTIVE, GO SHOP and GO HEAL were all off the
pad: a map with no row in the graph has no neighbours, so next_hop answers nothing and area_of
answers nothing. Named as a residual by the previous review and worked here.
Both ids come from the cartridge's own warp table, surveyed from the rung-10 checkpoint rather
than counted: Pewter City names 0x34 at (14, 7) and at (19, 5), which are the museum's two
doors, and 0x34 names 0x35 at (7, 7), which is the staircase. The upper floor has no area, for
the same reason a bedroom has none -- no front door of its own -- and the road out of it is the
staircase, which is what the fly needs there.
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