Understanding the Huffman coding procedures in digital communication with examples

We use Huffman's algorithm to obtain an encoding of alphabet {a, b, c} with frequencies fa, fb, fc. In each of the following cases, either give an example of frequencies (fa, fb, fc) that would yield the specified code, or explain why the code cannot possibly be obtained (no matter what the frequencies are (a) Code: {0,10,11} (b) Code: {0,1,00} (c) Code: {10,01,00} | Numerade