Counting text strings

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525047

I have a large XLS which has columns containing multiple text initial
of people separated by commas and spaces within each column such a
below. I need to be able to count the number of occurrences of eac
initial within a column into separate cells at the base of that column
Any bright ideas?

COLUMN A
IN1, BJ2, BJ3
IN1,BJ3
BJ2 BJ3
BJ2

COUNTS
IN1=xxx
BJ2=xxx
BJ3=xx
 
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