Pointed out by <Someone>: engraving with a cursed wand should pose a
risk of having it explode just like zapping does. [At the moment when one
explodes, any existing engraving doesn't get changed.] Suggested by someone
(<Someone>?) some time back: explosion due to recharging could be consolidated
with explosion due to zapping cursed wands. And noted by <Someone> in the
newsgroup: '+' in an engraving--perhaps written by someone trying to leave
bones file notes--should have a chance of being partially rubbed out to '-'.
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