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+:import std/Combinator .
+:import std/List .
+:import std/Math .
+
+factors \divs primes
+ divs y [[&[[&[[3 ⋅ 3 >? 4 case-1 (=?0 case-2 case-3)]] (quot-rem 2 1)]]]]
+ case-1 4 >? (+1) {}4 empty
+ case-2 3 : (5 1 (3 : 2))
+ case-3 5 4 2
+
+main [factors <$> ({ (+42) → (+50) })]