Ex 2.6: V^T = 9.33 x 10^4698  (log10 = 4698.97)
Ex 2.7: predicted Pr(o|b,a) = [0.3781 0.1602 0.4617]  empirical = [0.3775 0.16   0.4625]  max diff = 0.0008  (n = 400000)
Ex 2.9: offset c = +0.5: ratio T^pi = 0.900000000000, ratio T* = 0.900000000000, gamma = 0.9
Ex 2.9: offset c = -3.0: ratio T^pi = 0.900000000000, ratio T* = 0.900000000000, gamma = 0.9
