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My mother has always used index cards for all sorts of notes. She always has a little bundle clipped together with a binder clip in her purse, and she’ll whip it out to record how much she spent on lunch, or to note something she wants to mention to my uncle next time she speaks with him. Her grocery lists are kept on index cards, and a running to-do list, as well. She’ll even tape an index card to her front door to remind

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