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 ":".
After
the
battles
of
Lexington
and
Concord
,
Revolutionary
sentiment
within
New
England
reached
a
new
high
,
and
thousands
of
militiamen
from
the
Northern
colonies
converged
on
Boston
,
pushing
the
British
back
within
what
were
then
relatively
narrow
city
limits
.
After:O
the:O
battles:O
of:O
Lexington:location-GPE
and:O
Concord:location-GPE
,:O
Revolutionary:O
sentiment:O
within:O
New:location-GPE
England:location-GPE
reached:O
a:O
new:O
high:O
,:O
and:O
thousands:O
of:O
militiamen:O
from:O
the:O
Northern:O
colonies:O
converged:O
on:O
Boston:location-GPE
,:O
pushing:O
the:O
British:O
back:O
within:O
what:O
were:O
then:O
relatively:O
narrow:O
city:O
limits:O
.:O