Complete the Ice Palace followed by the Misery Mire Maze. Go to your house in the Dark World and buy the orange and white bomb.
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If you defeat the Bosses in Palaces 5 and 6 first, you can get the Super Bomb. This will allow you to get the fourth sword and the Silver Arrows, Because you can go to Palace 7, you can also get the Big Shield. Of course, you cannot get the red mail until you defeat the other Bosses.