#--------------------------------------#
#'@noRd
assert <- function (expr, error) {
if (!expr) stop(error, call. = FALSE)
}
#--------------------------------------#
#'@noRd
'%ni%' <- function(x,y){!(x%in%y)}
#--------------------------------------#
#'@noRd
is.empty <- function(x){ifelse(length(x)==0,TRUE,FALSE)}
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