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package qual;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.checkerframework.checker.units.qual.UnitsRelations;
import org.checkerframework.checker.units.qual.UnknownUnits;
import org.checkerframework.framework.qual.SubtypeOf;
/**
* Units of frequency, such as hertz (@{@link Hz}).
*
* @checker_framework.manual #units-checker Units Checker
*/
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
@SubtypeOf({UnknownUnits.class})
@UnitsRelations(FrequencyRelations.class)
public @interface Frequency {}
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