GeoFire/Implementation/GFQuery.m [511:518]:
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    @synchronized(self) {
        if (block == nil) {
            [NSException raise:NSInvalidArgumentException format:@"Block is not allowed to be nil!"];
        }
        FirebaseHandle firebaseHandle = self.currentHandle++;
        NSNumber *numberHandle = [NSNumber numberWithUnsignedInteger:firebaseHandle];
        switch (eventType) {
            case GFEventTypeKeyEntered: {
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GeoFire/Implementation/GFQuery.m [561:568]:
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    @synchronized(self) {
        if (block == nil) {
            [NSException raise:NSInvalidArgumentException format:@"Block is not allowed to be nil!"];
        }
        FirebaseHandle firebaseHandle = self.currentHandle++;
        NSNumber *numberHandle = [NSNumber numberWithUnsignedInteger:firebaseHandle];
        switch (eventType) {
            case GFEventTypeKeyEntered: {
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