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 ":".
Hence
a
wide
biodiversity
of
plants
and
animals
is
observed
in
the
evergreen
forest
surrounding
the
river
.
Hence:O
a:O
wide:O
biodiversity:O
of:O
plants:O
and:O
animals:O
is:O
observed:O
in:O
the:O
evergreen:O
forest:O
surrounding:O
the:O
river:O
.:O