Assertion: thunderbird | /r/HasProperty | free
Facets:
Source sentences:
text: Thunderbird is free.
text: It is Free Software and is available for Linux, Windows, and Mac OS X.
text: Thunderbird is a free e-mail client that allows users running Microsoft Windows, macOS, Linux, and other supported systems to send, receive, and manage their e-mail.
text: Is Thunderbird free?