设volumes of cup A=8,B=8,C=3；开始A和B满, C空. 以下操作过程总是用C作量具:
A8C0B8-->A8C3B5 (take 3)
A8C0B5-->A8C3B2 (take 2)
A8C3B0-->A8C0B3..(repeat moving from A to B using C)..-->A2C1B8 (take 1)
A2C0B8-->A0C2B8-->A0C3B7-->A3C0B7..(repeat moving from B to A)-->A8C1B1(take 1 & 1)
A8C0B0-->divide into 3, 3, and 2
In this process, we got 3, 2, 1, 1, 1, 3, 3, 2
So, 3+1=4, 3+1=4, 3+1=4, 2+2=4
