With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
These
legendary
rulers
ruled
between
c.
2850
BCE
to
2205
BCE
,
before
the
Xia
dynasty
.
These:O
legendary:O
rulers:O
ruled:O
between:O
c.:O
2850:O
BCE:O
to:O
2205:O
BCE:O
,:O
before:O
the:O
Xia:O
dynasty:O
.:O