Nothing
`sumSet` <-
function(g,n,p,y,set) {
z<-array(0.0,c(n,p))
for (j in set) {
gg<-g[,j]; ii<-which(!is.na(gg))
z[ii,]<-z[ii,]+y[[j]][gg[ii],]
}
return(z)
}
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