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小兔要去河对岸采蘑菇,可是河面上只有桥墩了。小猴送来了木板,小兔要怎样放置木板才能过河呢?这些木板连起来有多长呢?
Bunny go to the other side of the river mushrooms, but only the piers of the river. Monkey sent a wooden board, how to place the bunny to cross the river? How long are these boards together?