<image>(2011 Autumn • Huaiyin District School-level Midterm) Seven matchsticks can be arranged to form the shape of the number "8". Can you remove a certain number of matchsticks to form the following numbers?
(1) To form "6", remove ____ matchsticks;
(2) To form "5", remove ____ matchsticks;
(3) To form "3", remove ____ matchsticks;
(4) To form "2", remove ____ matchsticks.