Add another exception to differentiate Unknown/Ambiguous prefixes.
Add another exception to differentiate Unknown/Ambiguous prefixes.

eduOS/t,sheriferson/t,durcheinandr/t,eduOS/t,emi80/t,sjl/t,durcheinandr/t,sjl/t,durcheinandr/t,karabatov/ht,sheriferson/t,karabatov/ht,kovetskiy/t,eduOS/t,kovetskiy/t,emi80/t,emi80/t,kovetskiy/t