Parallel bidding: refers to the competition formed by various manufacturers providing different types of products to meet the same needs of customers. Which of the following are parallel competitions? ['Before the winter arrives, the electrical appliance store is full of all kinds of heating supplies, air conditioners, oil heaters, heating fans, electric blankets, high or low prices, styles or classic or trendy.', 'In order to expand market share, a company recently launched a tablet computer with a hard disk capacity of 64G, 128G and 256G specifications for consumers at different levels.', "As long as you walk into the underground mall, there will be a group of people around you, clothing, toys, food . you can't wait to pull you to your own booth.", 'Xiao Li got a year-end prize of more than 10,000 yuan and is ready to reward herself. Now she is struggling with traveling abroad, buying a laptop or gold jewelry.']