user: Question: What was actor Teresa Graves's series before the year 1993?
Columns: ['Year', 'Actor', 'Award', 'Series', 'Result']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1969.0, 'Diahann Carroll', 'Best TV Star – Female', 'Julia', 'Won']
SQL:

assistant: SELECT "Series" FROM "Table" WHERE "Year" < 1993.0 AND "Actor" = 'Teresa Graves';