Nothing
`cusp.probeersel` <-
function (alpha, beta)
{
w1 = cusp.extrema(alpha, beta)
w2 = cusp.curve(alpha, beta)
x = sort(c(w1, range(w2)))
y = dcusp.unnorm(x, alpha, beta)
dx = diff(x)
dy = filter(y, c(1/2, 1/2))[-5]
0.5 * y[1] * dx[1] + sum(dy * dx) + 0.5 * y[5] * dx[4]
}
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