Texas Instruments TI-83 Plus Graphing Calculator

I need to enter "1990-1991" on the graphing calculator for L1 to create a scatter plot. But idk how to enter the dash button? I know its not the negative or the subtract sign.

A: You can't. All lists, L1 to L6 included, can only hold quantitative numbers, and not strings. As a year, 1990-1991 would be a string, and not a number that holds much meaning.

If you have several of these (1990-1991, 1991-1992, etc), you're

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