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4 August 2017
I am working on particular url ( smarther.co/ios-app-development-company/ ) focusing this keyword( ios app development company )
It showed good progress in last week, it is in 5 th page.
but suddenly this week it doesn't listed anywhere in SERP.
NOTE : for other related keywords it is showing position but for this particular keyword it is not
kindly some one help me how to overcome from this
I didn't find the right solution from the Internet.