user: Question: How many points were there in a year earlier than 1977, a Cosworth V8 engine, and an entry from HB Bewaking Alarm Systems?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1974.0, 'Dalton-Amon International', 'Amon AF101', 'Cosworth V8', 0.0]
SQL:

assistant: SELECT SUM("Points") FROM "Table" WHERE "Year" < 1977.0 AND "Engine" = 'Cosworth V8' AND "Entrant" = 'HB Bewaking Alarm Systems';