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fun sum (t ::: Type) (_ : num t) (fs ::: {Unit}) (fl : folder fs) (x : $(mapU t fs)) =
foldUR [t] [fn _ => t]
(fn (nm :: Name) (rest :: {Unit}) [[nm] ~ rest] n acc => n + acc)
zero [fs] fl x
fun main () = return <xml><body>
{[sum {A = 0, B = 1}]}<br/>
{[sum {C = 2.1, D = 3.2, E = 4.3}]}
</body></xml>
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