Step through the construction below. Each time a new point is inserted, watch the tree decide whether it needs to split a region:
东坝大马灯起源于唐代，灵感源于汉代“骆驼载乐”的表演形式。到了明代，已是商贸重镇的东坝虽庙会繁盛，但春节期间大型娱乐活动匮乏，当地结合水乡多船少马的特点，以竹为骨、绒为皮，饰以马鞍缰绳、铜铃等，创制出可由两人共驭的巨型竹马。演出时，随着乐器伴奏，马队交替布阵，扮演刘备、关羽、张飞等三国人物的演员跃马出征，逐渐形成“七马出征”的固定阵型，成为“江南一绝”。2008年，东坝大马灯入选国家级非物质文化遗产名录。，详情可参考91视频
// 易错点4：条件写成"<"而非"<="，会导致相同值的元素被错误保留。关于这个话题，heLLoword翻译官方下载提供了深入分析
They carried out an array of experiments on board the orbiting lab and conducted spacewalks, with Suni breaking the record for the woman who spent the most hours outside of the space station. And at Christmas, the team dressed in Santa hats and reindeer antlers - sending a festive message for a Christmas that they had originally planned to spend at home.