What is the Chinese character next to the word horse?

1, Ma M?, 2, Yu Y, 3, Chi chí, 4, Todu?, Tuó,

5, training X, 6, refuting B, 7, donkey L, 8, driving Q,

9. Li, 10, Qian Dai, Dai, 1 1, Fu, 12, Ji,

13,jū, 14,nú, 15,shǐ, 16,sǐ,

17, Tuotu, 18, Yiyi, 19, z m 4 ng, 20, in ZH,