Choose two sides to rise: red and yellow, red and blue, yellow and blue, these three situations.

So one * * * is six kinds.

Choose a weight: 1K, 2K, 4K, and choose three weights respectively, so there are three kinds.

Choosing two weights is the sum of the two weights: 1K+2K = 3K, 1K+4K = 5K, 2K+4K = 6K, so there are three kinds.

Another weighing method is to add three weights: 1K+2K+4K=7K.

So a * * * can measure seven kinds of weights.

Write all prime numbers within 36: 2, 3, 5, 7, 1 1, 13, 17, 19, 23, 29, 3 1.

Choose the one that adds up to 36 here.

So it is 5+3 1.

7+29

23+ 13

17+ 19