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For anyone who is interested in sharing hints and solutions, please feel free to contact me at:
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Problem 11639 - 04 - By Omran Kouba (Syria).
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Problem 11637 - 04 - By Ovidiu Furdui (Romania).
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Problem 11633 - 03 - By Anthony Sofo (Australia).
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Problem 11629 - 03 - By Olivier Oloa (France).
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Problem 11623 - 02 - By Aruna Gabhe and M. N. Deshpande (India).
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Problem 11616 - 01 - By S. Siboni (Italy).
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