Anyone knows how to reload the current file in Ed?

I could type `e filename.txt` [1] to load that file into the buffer, but if I just want to reload the current file, is there a shortcut? I want to undo some changes.

1. http://www2.phys.canterbury.ac.nz/dept/docs/manuals/unix/DEC_4.0e_Docs/HTML/APS2HDTE/DOCU_009.HTM#no_id_145

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