{HEAD ~ Data values} for {TAIL ~ the set} of metrics for the field web sites can also be obtained from other publicly available information/sources in the web, such a from public ad placement keyword suggestion tools for search engines, by way of example 
for
{ HEAD ~ Data values } for { TAIL ~ the set } of metrics for the field web sites can also be obtained from other publicly available information / sources in the web , such a from public ad placement keyword suggestion tools for search engines , by way of example
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