With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Upstream
of
Hexham
the
river
,
although
still
tidal
,
becomes
meandering
and
more
difficult
for
vessels
to
navigate
.
Upstream:O
of:O
Hexham:location-GPE
the:O
river:O
,:O
although:O
still:O
tidal:O
,:O
becomes:O
meandering:O
and:O
more:O
difficult:O
for:O
vessels:O
to:O
navigate:O
.:O