Original sentence: The largest geographically contiguous group of Hindko speakers is concentrated in the districts of Abbottabad, Haripur, Mansehra and Kaghan valley of Pakistan, while there are a number of geographically isolated speakers of Hindko in cities like Peshawar and Kohat
Edited sentence: The largest geographically contiguous group of Hindko speakers is concentrated in the districts of Abbottabad, Haripur, Mansehra and Kaghan valley of Pakistan, while there are substantial number of geographically isolated speakers of Hindko in cities like Peshawar and Kohat