With no explanation, label each line with "O", "person-artist/author", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
In
summer
2011
,
bass
player
Serpentrax
was
forced
to
leave
the
band
for
personal
reasons
.
In:O
summer:O
2011:O
,:O
bass:O
player:O
Serpentrax:person-artist/author
was:O
forced:O
to:O
leave:O
the:O
band:O
for:O
personal:O
reasons:O
.:O