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Without furigana, I would read this as **** without hesitation. is already a stiff word, which is suitable for the inscription on the tombstone.
is very uncommon and sounds even stiffer to me. Probably there is no meaningful semantic difference from . (Of course, there are many common compounds using , like , , which are not stiff nor archaic at all.)
should be a archaic form of , but I think this won't be treated as a distinct verb according to the modern standard grammar.
In conclusion, I don't know why that example sentence is listed under . I would say it's there simply by accident.