Programming task: the optimum Huffman code dictionary

Source data: file is under processing by the Huffman encoder (page text)
To optimize the dictionary for
dict = { [0 0 0 1], [0 0 1 0], [0 0 1 1], [0 1 0 0],[0 1 0 1], [0 1 1 1], [0 1 1 0], [0 0 0 0],[1 0 0 0], [1 0 0 1],[1 0 1 0]}
the probability for