[Python] how to set the number of bing search result page to 50 in cookie

When I change the number of results on each page from 50 to 10, I find out that the number shows below changed to 10c.But When I put it in header like this:

"Cookie":"SRCHHPGUSR=CW=1241&CH=780&DPR=2&UTC=480&NEWWND=0&NRSLT=10c&SRCHLANG=&AS=1&NNT=1&HIS=1&HAP=0"

or

"SRCHHPGUSR":"CW=1241&CH=780&DPR=2&UTC=480&NEWWND=0&NRSLT=10c&SRCHLANG=&AS=1&NNT=1&HIS=1&HAP=0"

Both failed,just remaining returns 10. So does anybody here know how to set the number to 50?Thanks!

SRCHHPGUSR=CW=1241&CH=780&DPR=2&UTC=480&NEWWND=0&NRSLT=10c&SRCHLANG=&AS=1&NNT=1&HIS=1&HAP=0

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