Revelation 8:1

When [ο τ ε]. Read otan, the indefinite particle with the indicative mood. For a similar construction, see Mark 11:19 (correct reading). Alford observes that it occurs in the opening of this seal only, giving it an indefiniteness which does not belong to any of the rest.

There was [ε γ ε ν ε τ ο]. More literally, come to pass. Rev., there followed. About [ω ς]. A usual form of expression with John. See John 1:39; John 6:19; John 11:18.