I need help completing the following problem. It involves DES and ciphers.

Recall that for a block cipher, a key schedule algorithm determines the subkey for each round, based on the key K. Let K = (k_0k_1k_3... k_55) be a 56-bit DES key. List the 48 bits for each of the 16 DES subkeys K_1, K2, ..., K_16, in terms of the key bits k_i. Make a table that contains the number of subkeys in which each key bit k_i is used. Can you design a DES key schedule algorithm in which each key bit is used an equal number of times