'/ e' (or '/ `') lists nearby engravings (including headstones) that
the hero has read or felt (even if currently covered up) or can see
on the map;
'/ E' (or '/ |') lists all such on the level.
If the hero remembers an engraving and then monsters scuff it out of
existence, it will magically disappear from the list of remembered
engravings when deleted. I don't think that's worth bothering with.
[During testing, my pet seemed extremely reluctant to step on a
corridor engraving. That could have been coincidence but it seemed
to keep happening until I moved so close that it had no choice. I
wasn't carrying tripe.]
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