liitx

// https://en.wikipedia.org/wiki/De_Morgan%27s_laws -- context on de Morgan's Law
void main() {
  final Brand brand = Brand.toyota;
  final Region region = Region.na;
  bool isNaRegion = region == Region.na;
  bool isOcRegion = region == Region.oc;

  print('\ntest case:');
  print('NG -- skip: ${brand != Brand.toyota && !isOcRegion}');
  print('OK -- skip: ${brand != Brand.toyota || !isOcRegion}');

liitx

import 'dart:ui';

import 'package:flutter/material.dart';

void main() => runApp(const MyBlurryApp());

class MyBlurryApp extends StatelessWidget {
  const MyBlurryApp({super.key});

  @override