Assertion: thunderbird | /r/HasProperty | news
Facets:
Source sentences:
text: Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client.
text: Thunderbird is an email, newsgroup, news feed, and chat (XMPP, IRC, Twitter) client.
text: Thunderbird is a free, open-source, cross-platform application for managing email, news feeds, chat, and news groups.