It's getting as close as possible to the thought experiment of finding two families both of whom live in Brussels who are identical on every single one of these dimensions, but one of whom speaks Flemish and one of whom speaks French; or two families that live in a rural district in Nigeria, one of whom speaks Hausa and one of whom speaks Igbo.
ほとんど思考実験のようなものです 言語以外の属性が全て共通する ― ブリュッセル在住の２世帯で 一方はフレミッシュ語 他方はフランス語 あるいはナイジェリアの 農村部の２世帯で 一方はハウサ語 他方はイボ語という具合です