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- object DayEighteen extends App { println(List.iterate(".^^^.^.^^^^^..^^^..^..^..^^..^.^.^.^^.^^....^.^...^.^^.^^.^^..^^..^.^..^^^.^^...^...^^....^^.^^^^^^^", 40)(r => ('.' + r + '.').sliding(3).map(s => if (s(0) != s(2)) '^' else '.').mkString).map(_.count(_ == '.')).sum) }
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