Hi, for the first part
you need to save as much babies as possible
arrows are there to help,
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×if you have a bunch of babies following you, you may stuck them with arrows
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×you may hold a good bunch of babies behind the central tar if you give it the right shape initially
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×if you stuck babies to the east of tar, then you may deal 2 final blows to tar and leave to the west, with all the babies following
For the second part
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×order movement is essential
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×you need a stable configuration of babies that will move without loosing its shape, because of the distance the snake is, it is the only way a baby can reach the snake
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×you may save 15 babies