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    it's really sad he didn't answer :'D

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    you can write [...Array(columns).keys()] and get the same result as _.range(columns) without using lodash

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    I was a little bit confised at first, because I didn't see that granny also need to return home)) It's written in the description though ("the total distance X0X1 + X1X2 + .. + X4X0"), but at first glance seems like "permits her to visit her friends" was not going to include returning home. Maybe it can help someone who's also stuck