With no explanation, label each line with "building-library", "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Later
,
on
February
22
,
1898
,
Brett
opened
the
CPL
's
first
stand-alone
children
's
room
.
Later:O
,:O
on:O
February:O
22:O
,:O
1898:O
,:O
Brett:person-other
opened:O
the:O
CPL:building-library
's:O
first:O
stand-alone:O
children:O
's:O
room:O
.:O