Nothing
`p1p2.cef` <-
function (typ,p1,p2) switch (typ, b = p1p2.cef.b(p1,p2), l = p1p2.cef.l(p1,p2), v = p1p2.cef.v(p1,p2), h = p1p2.cef.h(p1,p2) )
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