user: Question: What's the total of rebs for ucla after 1973?
Columns: ['Player', 'Pos.', 'From', 'School/Country', 'Rebs', 'Asts']
Types: ['text', 'text', 'real', 'text', 'real', 'real']
Sample row: ['James Edwards Category:Articles with hCards', 'C', 1983.0, 'Washington', 1490.0, 530.0]
SQL:

assistant: SELECT SUM("Rebs") FROM "Table" WHERE "School/Country" = 'ucla' AND "From" > 1973.0;