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Fix accidentally-commented-out line
Un-commented a line that should have been executable.
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@ -516,8 +516,8 @@ students[,order(c("name","year","house","houseFounderName")), with=F]
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# 6: Draco 0 S Salazar
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# data.table makes summary tables easy
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students[,sum(year),by=house]
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# =>
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# students[,sum(year),by=house]
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# house V1
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# 1: G 3
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# 2: H 3
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