NIFTY expiry related sell off or start of retracement.

we have witnessed some last hour sell off in the market.
and candle stick suggests reversal.
however we should not forget today was weekly expiry day.
only if tomorrow we see a red candle breaking today's low
we can see some down side.
if today's factor was due to expiry we may see further rise of nifty crossing 12000
before a retracement takes place.
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