20.6. There is a full jug of milk with a capacity of 12 liters and two empty jugs of 8 liters and 5 liters. How to divide the milk into two equal parts
20.6. The following sequence of pourings can be applied:

$$
\begin{aligned}
(12,0,0) \rightarrow(4,8,0) \rightarrow(0,8,4) & \rightarrow(8,0,4) \rightarrow \\
\rightarrow(8,4,0) \rightarrow(3,4,5) & \rightarrow(3,8,1) \rightarrow(11,0,1) \rightarrow \\
& \rightarrow(11,1,0) \rightarrow(6,1,5) \rightarrow(6,6,0)
\end{aligned}
$$