The book is now available! 1901
(just those submitted by Poo Sung)
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+ 1901 = 1&13 + 2&12 + 3&11 + 4&10 + 5&9 + 6&8 + 7&7 + 8&6 + 9&5 + 10&4 + 11&3 + 12&2 + 13&1, where & denotes concatenation. [Poo Sung]




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