execl - In Excel how to do a pairing of A,B,C in form of AA,AB,AC,BA,BB,BC,CA,CB,CC depending upon the Consecutive row values in particular column -

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i need below thing. suppose have column contains values either of a,b or c follows.

column a b b b c

now have is, want count pair of aa, ab, ac likewise, based on 2 consecutive values, if first row contains , 2nd row contains a, aa count should 1 likewise go on.
tired can count 2 cells using following formula =countifs(a1, "=a",a2,"=b")
don't how go on increasing rows.
please help

please @ picture done above in excel, may have more accurate answer.

enter image description here


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