C(8,5)+C(7,5)+C(6,5)+C(5,5)
=C(8,5)+C(7,5)+C(6,5)+C(6,6)
=C(9,6)
C(8,5)+C(7,5)+C(6,5)+C(5,5)
=C(8,5)+C(7,5)+C(6,5)+C(6,6)
=C(9,6)
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