Six girls Tanya, Puja, Richa, Neha, Nisha and Arpita are sitting around a circular table facing towards the centre (not necessarily int the same order). Tanya and Puja are also sitting next to each other. Neha and Nisha are sitting next to each other. Only two girls are sitting between Richa and Tanya. Puja is to the immediate left of Arpita. Neha is not sitting next to Tanya. Who is to the immediate left of Tanya?