Nothing
`p1p2.c.l` <-
function (p1,p2) ifelse(!(le(0,p1) && le(p1,1) && le(0,p2) && le(p2,1)), NA, ifelse((eq(p1,0)&>(p2,0))||(eq(p1,1)&<(p2,1)), NA, (qnorm(1-p1)+qnorm(1-p2))/sqrt(2)))
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