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Mathematical Problems of Taiwan Province Scale
First, put three things together and weigh them as m.

After removing a, the weight of b and c is M 1.

Then the weight of the armor is m-m1;

Then it is called M2 together with a and b.

The weight of b is M2- (m-m).

Similarly, a and c are called M3.

The weight of c is M3-(M-M 1).