How do they drive away the evil spirit? (Read the text and answer the question)

In winter the river gypsies return to the main land and live in make-shift tarpaulin tents on open river banks.

In winter the gypsy women often spend their time: idly by hair doing, picking off lice in twos or threes sitting in a row.

The gypsies return to the main land because many water bodies dry up in winter.

River gypsies are an ethnic group of people in Bangladesh. They are also known as bedey.

They live in small country boats from May to December and they return to the main land to live in tents during winter.

They are born and brought up on roaming boats.