Assertion: protactinium's number | /r/HasProperty | leading zero
Facets:
Source sentences:
text: The B52s had 606-0842 in a song title in the early 1980's, but in most places in North America that was an invalid number as it would be taken as area code 606 (eastern Kentucky) followed by 084-2xxx as an invalid local number (leading zero, and three digits too short).