user: Question: What is the smallest number for Cars per Set built in 1977-1979 larger than 32?
Columns: ['Class', 'Operator', 'Number', 'Year Built', 'Cars per Set', 'Unit Numbers.']
Types: ['text', 'text', 'real', 'text', 'real', 'text']
Sample row: ['Class 253', 'BR Western Region', 27.0, '1975-1977', 9.0, '253001-253027']
SQL:

assistant: SELECT MIN("Cars per Set") FROM "Table" WHERE "Year Built" = '1977-1979' AND "Number" > 32.0;