Increasing unusual put option volume

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Kroger Co. (NYSE: KR) Delayed: 57.17 +0.56 (0.99%)
Previous Close $56.61    52 Week High $42.75 
Open $56.57    52 Week Low $28.71 
Day High $57.58    P/E 19.12 
Day Low $56.50    EPS $2.99 
Volume 701,209