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# Advent calendar 2018

## 17 December

For $$x$$ and $$y$$ between 1 and 9 (including 1 and 9), I write a number at the co-ordinate $$(x,y)$$: if $$x\lt y$$, I write $$x$$; if not, I write $$y$$.
Today's number is the sum of the 81 numbers that I have written.
Tags: numbers

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