Nothing
#if(!isGeneric("type")){
# setGeneric("type", function(object) standardGeneric("type"))
#}
#if(!isGeneric("center")){
# setGeneric("center", function(object) standardGeneric("center"))
#}
#if(!isGeneric("center<-")){
# setGeneric("center<-", function(object, value) standardGeneric("center<-"))
#}
#
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