SPY Options

I noticed there were three different expirations at the same strike on SPY options. I'm guessing one of them is the quarterly one, but what is the last one?
 
Quote from KrispyKreme50:
.....three different expirations at the same strike on SPY options.
?.....quarterlies, monthly American-style expiration and monthly European-style expiration?? :confused:
 
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