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| system software used to perform standard operations, such as sorting data for application programs or other system software |
| to incorporate new or more accurate information in a database, program or procedure |
Landlocked desert republic in north-central Africa, bordered by Sudan to the east; the Central African Republic to the south; Cameroon, Niger, and Nigeria to the west; and Libya to the north. N'Djamena is its capital and largest city.
Note: Chad was under French control until 1960.