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 ":".
If
the
United
States
[
or
any
external
power
]
can
not
sustain
its
engagement
,
it
would
do
better
not
to
intervene
at
all
.
If:O
the:O
United:location-GPE
States:location-GPE
[:O
or:O
any:O
external:O
power:O
]:O
can:O
not:O
sustain:O
its:O
engagement:O
,:O
it:O
would:O
do:O
better:O
not:O
to:O
intervene:O
at:O
all:O
.:O