@Yoona
I forgot what you taught us earlier, does the A usually imply bought and B sold?
These are some major $$$ on Puts for June 21. I've seen many like these hit over the past several days. If some HF knows the vote or knows that it won't matter, may be loading up for a massive rally or the converse?
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if you are not sure, just look at "put bullish" = this means you are bullish on put = this means you sold a put = -p
so that means the B is a sell (sold put)
that being said, strikes that are too far OTM are hard to guess on sentiment (they are probably hedges instead of bets)
here's another drawing you NEED to bookmark: be on the lookout on those 4 corners (if they are massive it means extreme bullish or extreme bearish)