 Complete the following phrase:  There was a presence of Sikhism in Sylhet after Guru Nanaks visit in 1508 to spread the religion. Kahn Singh Nabha has stated that in memory of Nanaks visit, Gurdwara Sahib Sylhet was established. This Gurdwara was visited twice by Tegh Bahadur and many hukamnamas were issued to this temple by Guru Gobind Singh. In 1897, the gurdwara fell down after the 