With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: The flag of Belgium (,) is a tricolour consisting of three equal vertical bands displaying the national colours of Belgium: black, yellow, and red. The colours were taken from the coat of arms of the Duchy of Brabant, and the vertical design may be based on the flag of France. When flown, the black band is nearest the pole (at the hoist side). It has the proportions of 13:15, which are unusual today, but which more closely matched the traditions of the time.
text_B: If a child knew nothing of geography, yet loved geometry and playing with miniature scale models of national flags, would this child have any reason to set Belgium's flag aside into a group, with Switzerland, the Vatican, and possibly even Nepal joining into this small group?
YES.