The distribution of plaintexts is
P(1) = 0.15, P(2) = 0.10, P(3) = 0.15, P(4) = 0.25, P(5) = 0.15, P(6) = 0.20
The distribution of keys is
P(1) = 0.20, P(2) = 0.05, P(3) = 0.05, P(4) = 0.35, P(5) = 0.20, P(6) = 0.15
Encryption with the key 1 maps the plaintexts {1,2,3,4,5,6} to ciphertexts {2,1,4,3,5,6}
Encryption with the key 2 maps the plaintexts {1,2,3,4,5,6} to ciphertexts {4,1,5,3,6,2}
Encryption with the key 3 maps the plaintexts {1,2,3,4,5,6} to ciphertexts {4,2,1,6,5,3}
Encryption with the key 4 maps the plaintexts {1,2,3,4,5,6} to ciphertexts {4,2,5,6,3,1}
Encryption with the key 5 maps the plaintexts {1,2,3,4,5,6} to ciphertexts {5,4,1,3,6,2}
Encryption with the key 6 maps the plaintexts {1,2,3,4,5,6} to ciphertexts {4,3,2,1,5,6}