Nothing
if(!isGeneric("xi"))
setGeneric("xi", function(object) standardGeneric("xi"))
if(!isGeneric("xi<-"))
setGeneric("xi<-", function(object,value) standardGeneric("xi<-"))
if(!isGeneric("nu"))
setGeneric("nu", function(object) standardGeneric("nu"))
if(!isGeneric("nu<-"))
setGeneric("nu<-", function(object,value) standardGeneric("nu<-"))
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