6
6x2 & 6x3
12, 18
7x3 & 7x4
21, 28
8x3 & 8x4
24, 32
12x3 & 12x4
36, 48
2^2 & 3^3
4, 9
6x4 & 6x5
24, 30
7x5 & 7x6
35, 42
8x5 & 8x6
40, 48
12x5 & 12x6
60, 72
4^4 & 5^5
16, 25
6x6 & 6x7
36, 42
7x7 & 7x8
49, 56
8x7 & 8x8
56, 64
12x7 & 12x8
84, 96
6^6 & 7^7
36, 49
6x8 & 6x9
48, 54
7x9
63
8x9
72
12x9 & 12x11
108, 132
8^8 & 9^9
64, 81
6x12
72
7x12
84
8x12
96
12x12
144
11^11 & 12^12
121, 144