2.10. On the basis of Theorem 2.9, what can be said about the existence of prefix-free ternary (b=3) codes with the following parameters? (i) n1=0,n2=1,n3=12; (ii) n1=0,n2=1,n3=12,n4=40. 2.11. If the conclusion of the previous exercise is that a prefix-free codc must exist, construct one