First, let's list all the possible sums when rolling two of these unusual dice:
1+1=2, 1+2=3, 1+3=4, 1+5=6, 1+7=8, 1+9=10
2+1=3, 2+2=4, 2+3=5, 2+5=7, 2+7=9, 2+9=11
3+1=4, 3+2=5, 3+3=6, 3+5=8, 3+7=10, 3+9=12
5+1=6, 5+2=7, 5+3=8, 5+5=10, 5+7=12, 5+9=14
7+1=8, 7+2=9,
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