Learn Git by Building an SQL Reference Object - Build an SQL Reference Object

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I need to delete everything so i can reset the course, i tried resetting it but there is a bug where even if i manually delete the folders, it recognizes the sql_reference file as an existing file, so it doesnt lets me continue after step 2, i need to delete everything from terminal so i can start again, otherwise i cant complete this lesson.

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Learn Git by Building an SQL Reference Object - Build an SQL Reference Object