user: Question: What's the RECNet when the identifier is CBF-FM-20?
Columns: ['City of license', 'Identifier', 'Frequency', 'Power', 'Class', 'RECNet']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ["L'Annonciation ( Rivière-Rouge )", 'CBF-FM-15', '88.3 FM', '4,600 s watt', 'B', 'Query']
SQL:

assistant: SELECT "RECNet" FROM "Table" WHERE "Identifier" = 'CBF-FM-20';