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2. T List n:{0...0}, i:(0-n). nth_tl(n;nil)[i] = nil[(i+n)] T | Auto |
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2. T List 3. u : T 4. v : T List 5. n:{0...||v||}, i:(||v||-n). nth_tl(n;v)[i] = v[(i+n)] n:{0...||v||+1}, i:(||v||+1-n). nth_tl(n;u.v)[i] = (u.v)[(i+n)] | 5 steps |
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