In addition to definitions of public procedures and functions, the implementation section can declare constants, types
(including classes), variables, procedures, and functions that are
private to the unit. That is, unlike the interface
section, entities declared in the implementation section are inaccessible to other units.
The implementation section can include its own uses clause, which must appear immediately after the keyword
implementation. The identifiers declared within units specified in the implementation section are only available for
use within the implementation section itself. You cannot refer to such identifiers in the interface section.
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