After some research on Fai Young's original works, the original related magic
circle is as follows:

which is equivalent to

It says the sum of the numbers along the straight (vertical or horizontal)
or tited lines or the circumference equals 147, which means the number 9 at
the centre is included in the calculation (138 + 9 = 147). I think Fai Young's
intention is to involve all the consecutive numbers from 1 to 33 in constructing
the magic circle.
Reference: 
written on October 1, 2002
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