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##' Remove any duplicate cities in a tsp instance.
##'
##' @param instance [\code{tsp_instance}]\cr
##' TSP instance object.
##' @return New TSP instance in which all duplicate cities have been
##' removed.
##' @export
remove_zero_distances = function(instance) {
## FIXME: Handle distance only instances?
tsp_instance(coords = unique(instance$coords))
}
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