For manuscripts that contained the whole New Testament, such as Codex Alexandrinus (A) and Codex Ephraemi Rescriptus (C), the letters corresponded across content groupings. For significant early manuscripts such as Codex Vaticanus Graecus 1209 (B), which did not contain Revelation, the letter B was also assigned to a later 10th-century manuscript of Revelation, thus creating confusion. Constantin von Tischendorf found one of the earliest, nearly complete copies of the Bible, Codex Sinaiticus, over a century after Wettstein's cataloging system was introduced. Because he felt the manuscript was so important, Von Tischendorf assigned it the Hebrew letter aleph (א). Eventually enough uncials were found that all the letters in the Latin alphabet had been used, and scholars moved on to first the Greek alphabet, and eventually started reusing characters by adding a superscript. Confusion also existed in the minuscules, where up to seven different manuscripts could have the same number or a single manuscript of the complete New Testament could have 4 different numbers to describe the different content groupings.