ref: 8e3c92b4eae6ff958d8af946caf6fb7d7f3bfbf7
dir: /test/p.42/
/Asia/ { pop["Asia"] += $3 }
/Africa/ { pop["Africa"] += $3 }
END { print "Asian population in millions is", pop["Asia"]
print "African population in millions is", pop["Africa"] }