Sophocles, Oedipus at Colonus 1466-7, with the gloss of the scholia there.
Note that the editors of the most recent edition of Sophocles, Lloyd-Jones and Wilson (= TLG), adopt Meineke's conjecture ou)rano/n ("for lightning burns heaven again"). The codices (and the indirect tradition of the Suda) have ou)rani/a. Campbell (1879) argued that the manuscript reading here is "metrically indefensible" (414) and reads ou)ranou= instead ("for lightning of heaven blazes again"). Jebb (1928) explains that "Heinrich Schmidt defends ou)rani/a as ¯ˇ¯: others deny that such a synizesis is possible" (226). Jebb's examples, however, from Aeschylus suggest that the synizesis is possible. Likewise, West (1990) seems to allow synizesis with words of this type in Aeschylus, explaining that "i, u syllabam non faciunt" (XXXIV). One example is kardia=s at Aeschylus, Seven against Thebes 288, where kardia=s in the strophe corresponds to e)xqroi=s in the antistrophe (305).