michaelmior / NoSE

        # Add the initial one or two entities

        @entities = [create_entity(0)]

        return if @nodes_nb == 1

        @entities << create_entity(1)

        add_link 0, 1

        return if @nodes_nb == 2

        # Add and connect more entities as needed

        edges = 2

        2.upto(@nodes_nb - 1).each do |node|

          @entities << create_entity(node)

          pick = Pickup.new(0.upto(node - 1).to_a,

                            weight_func: ->(x) { x },

                            uniq: true) { |n| @neighbours[n].size }

          pick.pick(2).each do |node2|

            add_link node, node2

            edges += 2

          end

        end

      end