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Given the country sums below, what country sums up the last one?

EGYPT + HUNGARY = CHILE
GREECE + SPAIN = NEW ZEALAND
GREECE + PERU = JAPAN
SWITZERLAND + AUSTRIA = VIETNAM
SWITZERLAND + CUBA = SRI LANKA
CHILE + VIETNAM + SRI LANKA = NIGERIA
NEW ZEALAND + JAPAN + SRI LANKA = SÃO TOMÉ AND PRINCIPE
MAURITANIA + ANDORRA = URUGUAY
ERITREA + BOSNIA AND HERZEGOVINA = VANUATU
SÃO TOMÉ AND PRINCIPE + URUGUAY + AUSTRIA = BANGLADESH

VIETNAM + NIGERIA + VANUATU = ??

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The addition adds the

country calling codes.

For example

Egypt is +20 and Hungary is +36, this means that Egypt + Hungary is +56 which indeed corresponds to the country calling code of Chile.

This means that the answer is

Vietnam (+84) + Nigeria (+234) + Vanuatu (+678) = Kyrgyzstan (+996).

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