Print a joint probability

The joint probability of qubits specified by ``bit labels'' being in the state specified by binary numbers `` $x_a~~x_b~~x_c~~...$'' is output to the stdout by the command

prob (bit labels, $x_a~~x_b~~x_c~~...$);

For instance,

prob (1 3-5 8 9, 0 1 0 0 1 0);

shows the joint probability $\mathrm{Pr}(0_1 1_3 0_4 0_5 1_8 0_9)$ (subscripts are the labels of qubits).