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DoSth d1=new DoSth (Say);Attempt, we used onion skin or persmmon-based dyes combined with blue; In this case, the blue dye acted as a strengthener for the weaker green or pink dyes, preserving the overall color nonetheless. The combinations can of course be altered to answer any color requirements, but it is worth remembering."Hello everyone, this is the first qualifying match for the primary election of the Dream of Red Mansions League. It is very rare. Today we see someone challenging hell again..." When the anchorwoman's cheerful and excited voice sounded...Algorithm class:企鹅家族（PINGU）是由瑞士制作，风靡全世界的一部黏土动画卡通，以全世界共通的企鹅语言沟通生动，逗趣的画面，加上诙谐，丰富的故事内容，贴切的刻画出亲情和友情的温馨气氛，更是牢牢地抓住了每一个人的心，企鹅家族（PINGU）俨然已成为全世界家喻户晓的卡通人物，而这个故事发生在遥远的南极世界，爸爸，妈妈，爷爷，PINGU，PINGA和小海豹这部温馨故事系列中的基本成员，而题材的来源正是取自他们日常生活中的点点滴滴。This class can meet the basic requirements, but if we put a class like this without thread safety protection into a multi-threaded environment, there will definitely be problems. How to solve them? The first thing we think of is adding the synchronized keyword to the getInstance method, as follows:Public interface Observer {