#### SYSTEM-88

Proposed by Daniel Sitaru-Romania SYSTEM-88 Solution 1 by Lazaros Zachariadis-Thessaloniki-Greece,Solution 2 by Florentin Vișescu-Romania,Solution 3 by Mohamed Amine Ben Ajiba-Tanger-Morocco

#### SYSTEM-86

Proposed by Carlos Paiva-Fortaleza-Brazil SYSTEM-86 Solution by Amir Sofi-Pristina-Kosovo

#### SYSTEM-85

Proposed by Daniel Sitaru-Romania SYSTEM-85 Solution 1 by Mohammad Rostami-Kabul-Afghanistan, Solution 2 by Serlea Kabay-Liberia

#### SYSTEM-84

Proposed by Orlando Irahola Ortega-Tarija-Bolivia SYSTEM-84 Solution 1 by Carlos Eduardo Aguiar Paiva-Fortaleza-Brazil, Solution 2 by Mohamed Amine Ben Ajiba-Tanger-Morocco…

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#### SYSTEM-83

Proposed by Daniel Sitaru-Romania SYSTEM-83 Solution 1 by Adrian Popa-Romania, Solution 2 by Mohamed Amine Ben Ajiba-Tanger-Morocco, Solution 3 by…

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#### SYSTEM-82

Proposed by Daniel Sitaru-Romania SYSTEM-82 Solution by Mohammad Rostami-Kabul-Afghanistan

#### SYSTEM-81

Proposed by Orlando Irahola Ortega-Tarija-Bolivia SYSTEM-81 Solution by Rahim Shahbazov-Baku-Azerbaijan