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 ":".
Because
local
service
was
only
offered
by
the
GG
trains
which
only
ran
into
Brooklyn
,
riders
were
forced
to
transfer
at
express
stations
to
reach
Manhattan
.
Because:O
local:O
service:O
was:O
only:O
offered:O
by:O
the:O
GG:O
trains:O
which:O
only:O
ran:O
into:O
Brooklyn:location-GPE
,:O
riders:O
were:O
forced:O
to:O
transfer:O
at:O
express:O
stations:O
to:O
reach:O
Manhattan:location-GPE
.:O