5.18. The following table gives the frequencies of the letters of the English language (including the blank for separating words) in a particular corpus. blank 18.3%| r 4.8%ly 1.6% 10.2%| d 3.5%| p 1.6% t 7.7% | 13.4% | b 1.3% 6.8%| 2.6%|v 0.9% 5.9%lu 2.4%| k 0.6% 5.8%1 m 2.1%| j 0.2% 5.5%| w 1.9% x 0.2% 5.1%| f 1.8%| q 0.1% | g 1.7%|z 0.1% 0 4.9% (a) What is the optimum Huffman encoding of this alphabet? (b) What is the expected number of bits per letter