ten years.
ten years later when they met, they discussed with each other what they had learnt. the first brother said, "i can make a skeleton out of a single bone of an animal." the second said, "i can cover a skeleton with flesh." the third said, "i can cover a flesh-covered skeleton with skin and hair." the fourth said, "i can put life into a dead animal." they decided to demonstrate their skills. they found a bone and first brother turned it into a skeleton, the second one covered it with flesh. the third one covered it with skin and hair. now it looked like a dead lion. as soon 