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Only two: (4, 9) and (6, 6). In all other factor pairs, one of the numbers is not composite.
1 x 36 2 x 18 3 x 12 4 x 9 6 x 6
The factor pairs of 26 are: 1 × 26 2 × 13
108,154,236,327,418,612,9
140,170,235,428,520,714,10