Shortened form: "ve" omitted in 3rd person plural perfect indicative.

[BrRoman]

3rd person plural perfect indicative for perfect stems in āv, ēv, ōv: ve is omitted, e.g.
+laudaverunt → laudarunt,
+requieverunt → requierunt,
cognoverunt → cognorunt

[BrRoman]

'+' before words done.