In east (Indian) Punjab, Hindus and Sikhs massacred Muslims; in west (Pakistani) Punjab, the Muslims massacred Sikhs and Hindus.
Muslims made up a majority of the population in east Punjab.  
mnli hypothesis: Muslims made up a majority of the population in east Punjab.   premise: In east (Indian) Punjab, Hindus and Sikhs massacred Muslims; in west (Pakistani) Punjab, the Muslims massacred Sikhs and Hindus.