 Complete the following phrase:  Amitabha Gupta writes in his photogaphers note: This brick-built Mosque at Kheraul alias Kherur with a single domed square prayer chamber and a triple domed verandah on the front with four minarets at four corners was erected by Rafat Khan in 1495 AD during the reign of Alaud-Din Husain Shah on the basis of two inscriptions on the mosque. The hemispherical dome of the main prayer chamber fell down in the 