: this radical brings the sound of 'uai' in the following examples

Examples:
快 pinyin: kuài

Chinese phrase: 快乐 kuài lè - happy
快车 kuài chē - express train

块
pinyin: kuài

Chinese phrase: 糖块 táng kuài - hard candy
一块钱 yī kuài qián - one yuan

筷 pinyin: kuài

Chinese phrase: 筷子 kuài zǐ - chopsticks