'Pr' used in million biggest domains list by Alexa.com:
wordpress.comwordpress.org
files.wordpress.com
aliexpress.com
americanexpress.com
vnexpress.net
'Pr' used in other domains:
hugephotoprinter.com2improvehealth.com
c2cproduction.com
masterprochallenge.com
bluebookprices.com
pro-fex.com
Statistical data
"pr" has the frequency of use of 0.0017% on city-data.com forum
"Pr" has the frequency of use of 0.0014% on en.wikipedia.org.
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