With no explanation, label each line with "O", "product-software", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Historically
,
BSD
was
also
commonly
called
``
BSD
Unix
``
or
``
Berkeley
Unix
``
.
Historically:O
,:O
BSD:product-software
was:O
also:O
commonly:O
called:O
``:O
BSD:product-software
Unix:product-software
``:O
or:O
``:O
Berkeley:product-software
Unix:product-software
``:O
.:O