I have two distinct, fair, six-sided dice that have positive integers on their sides. Neither of the dice is a "normal" die (i.e., with 1, 2, 3, 4, 5, and 6 on the sides).

Interestingly, the probability distribution of the sum of rolling these two dice is exactly the same as that of the sum of rolling 2 "normal" dice.

Let the numbers on the first die be \((a_1, a_2, a_3, a_4, a_5, a_6),\) and those on the second \((b_1, b_2, b_3, b_4, b_5, b_6), \) where \(a_1\leq a_2 \leq\cdots\leq a_6\) and \(b_1\leq b_2 \leq \cdots\leq b_6.\)

Submit your answer as the product of these two 6-digit integers: \(\overline{a_1 a_2 a_3 a_4 a_5 a_6} \times \overline{b_1 b_2 b_3 b_4 b_5 b_6 }. \)

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