With no explanation, label each line with "O", "other-chemicalthing", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
There
are
several
different
drugs
that
have
been
used
to
alleviate
symptoms
experienced
after
a
head
injury
including
anti-depressants
such
as
amitriptyline
and
sertraline
.
There:O
are:O
several:O
different:O
drugs:O
that:O
have:O
been:O
used:O
to:O
alleviate:O
symptoms:O
experienced:O
after:O
a:O
head:O
injury:O
including:O
anti-depressants:O
such:O
as:O
amitriptyline:other-chemicalthing
and:O
sertraline:other-chemicalthing
.:O