defroster lines... series or parallel?

Hi was wondering if anyone knew if the defroster lines on the back window are electrically in series or parallel. And if in series what corner does the current enter? Trying to remove this tint that's bubbling and trying to figure out which corner to start at.

Parallel. If they were in series, when one burned out, the rest wouldn't work.

Yeah I realized it was a pretty dumb question lol but the good news is that I successfully removed the horse**** on the rear window without messing up any defroster lines. I highly suggest getting a handheld steamer and then cleaning up with iso alcohol. Took a minute but came out nice.