premise: Papyrus Oxyrhynchus 22 (P. Oxy. 22) contains fragments of the "Oedipus Tyrannus" by Sophocles, written in Greek. It was discovered by Grenfell and Hunt in 1897 in Oxyrhynchus. The fragment is dated to the fifth century. It is housed in the British Library (Department of Manuscripts). The text was published by Grenfell and Hunt in 1898.
hypothesis: The fragment was made in the 400s.
reason: The fifth century is the 400s, not the 500s.