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Default Can an Array formula count unique values and report no. of times for each?

Hi,

Is it possible to use an array formula on a range and have it report
the unique values in that range and the number of times each was
encountered?

Barring an array formula solution (preferred) I would entertain a
macro solution.

Thanks,

Norm

XL2002
Windows2000

Eaxample: To get the unique entries in Col A and report then in Col B
and the number of times for each in Col C.

Col A Col B Col C
1 1 1
3 3 1
7 7 1
9 9 3
9 12 1
9 16 1
12 21 2
16 33 1
21 44 1
21 78 7
33 81 1
44 132 1
78 156 1
78
78
78
78
78
78
81
132
156
 
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