16. Help Pinocchio arrange all 28 domino bones into four piles so that the sums of the points in the piles are four consecutive prime numbers.
16. Let's find the sum of all the points on the dominoes. The domino tiles look like this:
```
\(\begin{array}{lllllll}00 & 11 & 22 & 33 & 44 & 55 & \underline{66}\end{array}\)
\(\begin{array}{lllllll}01 & 12 & 23 & 34 & 45 & 56 & 12\end{array}\)
\(\begin{array}{llllll}02 & 13 & 24 & 35 & 46 & 21\end{array}\)
\(\begin{array}{lllll}03 & 14 & 25 & 36 & 27\end{array}\)
\(\begin{array}{llll}04 & 15 & \underline{26} & 30\end{array}\)
\(\begin{array}{lll}05 & 16 & 30\end{array}\)
\(06 \quad 27\)
21
```

142

The sum of all points: \(21+27+30+30+27+21+12=168\). Let's find the average number of points in the piles: \(168: 4=42\). Then the required prime numbers are \(37,41,43,47\). Indeed, \(37+41+43+47=168\). The dominoes can be arranged into such piles in different ways.