user: Question: Which Alpha premultiplied has a 4:1 Compression ratio and a DXT3 FOURCC?
Columns: ['FOURCC', 'DX 10 Name', 'Description', 'Alpha premultiplied?', 'Compression ratio', 'Texture Type']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['DXT1', 'BC1', '1-bit Alpha / Opaque', 'N/A', '6:1(for 24 bit source image)', 'Simple non-alpha']
SQL:

assistant: SELECT "Alpha premultiplied?" FROM "Table" WHERE "Compression ratio" = '4:1' AND "FOURCC" = 'DXT3';