Count Cells According To Criteria?

I have a spreadsheet like this:

a
a
b
c
c
d

a
-
2
2
-

[Code] .......

and I would like to create a second spreadsheet that lists how many cells have a number for each combination ("a"x"a", "a"x"b", "a"x"c", ... "b"x"a", "b"x"b"....)
so in this case it would become this:

a
b
c
d

a
1
1
0
0

[Code] ....

is there a formula that i could use to do this easily?