The researchers removed four thousand letters .

VOA: special.2010.07.20

Okay, so there are two designations used for God. Yahweh, which is the sacred Tetragrammaton, it's written with four letters in Hebrew, they don't include vowels.

上帝有两个名字，耶和华，犹太人上帝的名字,在希伯来语由四个字母构成，希伯来语没有元音。

耶鲁公开课 - 旧约导论课程节选

They are linked together by four different colored segments indicated here not by colors now but by letters.

它们由四个不同颜色的片段连接,这里不是用颜色表示,是用字母表示

耶鲁公开课 - 生物医学工程探索课程节选