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func[ø][afunc[s][n: 0 foreach ¼c ø[as[n: an + ¼]a];c]n];ƈ
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func[ø][a: 0 foreach ¼ ø[a: a + ¼]a];
Try it online!
func[s][n: 0 foreach c s[n: n + c]n];ƈ
f: func[U][ofunc[ø][a: 0 foreach d¼ U[oø[a: adda o+ d]o];¼]a];
f: func[U][o: 0 foreach d U[o: add o d]o];
