user: Question: What is the number of the model with Three Parallel printer ports?
Columns: ['Model number', 'Printer ports', 'Network ports', 'Network protocols', 'Firmware', 'Notes']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['EX Plus', 'One Parallel', '10Base-2 and 10Base-T', 'TCP/IP, IPX/SPX, and DLC/LLC', 'Flash EEPROM', 'BOOTP & DHCP Client']
SQL:

assistant: SELECT "Model number" FROM "Table" WHERE "Printer ports" = 'Three Parallel';