require_relative 'range/combine.rb'
require_relative 'range/overlap.rb'
#require_relative 'range/quantile.rb'     # uncommon
#require_relative 'range/op_add.rb'       # too new
#require_relative 'range/op_sub.rb'       # too new
require_relative 'range/to_rng.rb'
require_relative 'range/umbrella.rb'
require_relative 'range/within.rb'

