I often have the same trouble. Maybe this will help, and I think "they" and "them" (or "those") would be your test words:
Quote:
Try substituting “he” or “she” and “him” or “her.” If “he” or “she” fits, you should use who. If “him” or “her” fits, you should use whom. Keep in mind that you may have to temporarily rearrange the sentence a bit while you test it...
https://www.grammarly.com/blog/who-v...u-might-think/
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So in your case, I think it would be "You were one of four (among them/those) who remembered."
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| manic-depressive with psychotic tendencies (1977) | chronic alcoholism (1981) | Asperger burnout (2010) | mood disorder - nos / personality disorder - nos / generalized anxiety disorder (2011) | chronic back pain / peripheral neuropathy / partial visual impairment | Gastrointestinal Stromal Tumors (incurable cancer) |
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