四一二

四一二	sì yī èr	12th April / refers to Chiang Kai-shek's coup of 12th April 1927 against the communists in Shanghai
四	sì	four / 4
一	yī	one / single / a (article) / as soon as / entire; whole; all; throughout / "one" radical in Chinese characters (Kangxi radical 1) / also pr. [yao1] for greater clarity when spelling out numbers digit by digit
一二	yī èr	one or two; a few / a little; just a bit
二	èr	two / 2 / (Beijing dialect) stupid