11. (9 points) With 70 yuan, four types of books, Jia, Yi, Bing, and Ding, were bought, totaling 10 volumes. It is known that the prices of Jia, Yi, Bing, and Ding books are 3 yuan, 5 yuan, 7 yuan, and 11 yuan per book, respectively, and at least one book of each type was purchased. How many different ways of purchasing are there? $\qquad$