Question about upstream O2 sensor harness
 

Hello,
Brandnew to forums (after many years in IT, oh well) so hopefully I'm doing this right. I've spent many hours trying to Google the answer with no luck. I believe something chewed through the wires on the harness
connector to the upstream O2 sensor and I can't tell which wire went where on the pigtail. If anyone can assist, that would be greatly appreciated. Let me know if more info is needed and many thanks for taking a look.
https://cimg8.ibsrv.net/gimg/www.maz...1263ea813b.jpg

Just noticed I forgot to add a somewhat significant piece of information - it's a 2006 Mazda 3 with the 2.3L engine.