Former US Secretary of Defense, Donald Rumsfeld, famously popularized the phrase "known knowns." Here we're going to distill his remarks into a four-line stanza.
Specifically, output this text:
known knowns known unknowns unknown knowns unknown unknowns
Capitalization doesn't matter (for example,
Known unKnowns is fine), and a single trailing newline is acceptable, but no other formatting changes are allowed. That means a single space between the words, and either
LF (59 bytes) or
CR/LF (62 bytes) between the lines.