No pictures.
Sanitary tee is required when a horizontal trap arm turns into a vertical drain and a vertical vent take off.
Sanitary tee is allowed when a horizontal drain meets a vertical drain.
IPC may allow a sanitary tee on its back for a vent take off with the drain remaining horizontal; UPC requires a combo there, and I think a combo is better.
Otherwise use a combo (edit: for drains).
Cheers, Wayne