With no explanation, label each line with "location-GPE", "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
O'Brien
's
death
sentence
was
commuted
to
one
of
transportation
and
he
received
an
unconditional
pardon
in
1856
,
after
which
he
returned
to
Ireland
.
O'Brien:person-other
's:person-other
death:O
sentence:O
was:O
commuted:O
to:O
one:O
of:O
transportation:O
and:O
he:O
received:O
an:O
unconditional:O
pardon:O
in:O
1856:O
,:O
after:O
which:O
he:O
returned:O
to:O
Ireland:location-GPE
.:O