How to do selective data processing in PIG?

Hi,

I have a text data file, and i need to load only lines 10 to line 20 into a relation in PIG for further processing.
These lines do not have field in common to use FILTER feature of PIG.
Can you please tell me how it is done?
I have tried out writing a UDF but, i am not able to figure out the logic to choose only these specific lines.

Many Thanks for your help.

Please reply at the earliest.

Best Regards,
Ashwin Hosbett