Day6

-- Get all lines from a file, return nil if the file does not exist or retutn the sum of all the lines if it exist
function findclosest(coord,x,y)
    for i=1, ncoord do
        for j=1, ncoord do
            if 
        end
    end
end
 
function lines_from(file)
    coord = {}
    i = 1
    for line in io.lines(file) do 
        coord[i] = {}
        x,y = line:match("(%d+),%s(%d+)")
        coord[x][y] = i 
        i = i + 1
    end
    ncoord = i - 1
 
    for i=1, ncoord do
        for j=1, ncoord do
             if not coord[x][y] then
                 findclosest(coord,x,y)
             end
        end   
    end
 
end

lines_from(stdin)