19) grep -Po '(?<![0-9]\s)\b[A-Z][a-z]{1,10}\s+(?!Avenue)[A-Z][a-z]{1,10}\b' CYFI727_Roster_2028.txt
20) grep -Po '(?<![0-9]\s)\b[A-Z][a-z]{1,10}\s+(?![Ave|St|Dr])[A-Z][a-z]{1,10}\b' CYFI727_Roster_2028.txt
22) 
echo  "My phone number is 1234567890" | grep -E "[0-9]{10}“
echo  "The serial number  is 1234567890123" | grep -E "[0-9]{10}“
echo  "My phone number is 1234567890" | grep -E "\b[0-9]{10}\b“
echo  "The serial number  is 1234567890123" | grep -E "\b[0-9]{10}\b“