local({
f1 = 'tools/pkgs-custom.txt'
x1 = sort(scan(f1, 'character'))
writeLines(x1, f1)
f2 = 'tools/pkgs-yihui.txt'
x2 = setdiff(scan(f2, 'character'), scan(f1, 'character'))
writeLines(sort(x2), f2)
})
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