Ten books are arranged in a row following a certain sequence. Among them 3 are History, 3 are Economics, 2 are Maths and 2 are English. From the left, there is an English book between a History and Maths book, a History book between a Maths and an English book, an Economics book between an English and a Maths book, a Maths book between two Economics books and two Economics book between a Maths and a History book. Book of which subject is at the sixth position from the left?