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The three letters
Country
ABC
Cambodia/Central African Republic/Colombia/Cuba/Dominican Republic/Democratic Republic of the Congo
BCD
Cambodia/Dominican Republic/Democratic Republic of the Congo
CDE
Cape Verde/Dominican Republic/Democratic Republic of the Congo/Ecuador/Iceland/North Macedonia/Saint Vincent/United States of America
DEF
Democratic Republic of the Congo/United States of America
EFG
Democratic Republic of the Congo
FGH
Afghanistan/Democratic Republic of the Congo
GHI
Afghanistan/Bosnia/Democratic Republic of the Congo/Saint Vincent
IJK
Tajikistan
LMN
Dominican Republic/Democratic Republic of the Congo/Marshall Islands/Mongolia/Solomon Islands
MNO
Cameroon/Dominica/Dominican Republic/Democratic Republic of the Congo/Monaco/Mongolia/Montenegro/North Macedonia/Oman/Romania/San Marino/Sao Tome and Principe/Solomon Islands/United Kingdom/United States of America/Micronesia
NOP
Dominican Republic/Democratic Republic of the Congo/Poland/Sao Tome and Principe/Singapore
RST
Australia/Austria/Costa Rica/Ivory Coast/Kyrgyzstan/Netherlands/Sao Tome and Principe/South Africa/South Korea/Saint Vincent/Switzerland/East Timor/Turkmenistan/United Arab Emirates/United Statesof America
STU
Australia/Austria/Saint Lucia/South Africa/South Korea/South Sudan/Tunisia/Turkmenistan/United Arab Emirates/United States of America/Uzbekistan