Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What was the lowest city population for the district of rajanpur district with a area of 6 km squared and a serial number less than 29?

### Inputs:
table_name: table, columns: ['Serial No.', 'District', 'Headquartered City', 'City Population (2009)', 'City Area(km 2 )']

### Response:
SELECT MIN City Population (2009) FROM table WHERE City Area(km 2 ) = 6 AND District = rajanpur district AND Serial No. < 29