With no explanation, label each line with "person-politician", "O", "organization-government/governmentagency", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
In
1990
,
the
United
Kingdom
Conservative
government
,
headed
by
Prime
Minister
Margaret
Thatcher
introduced
a
poll
tax
,
which
was
very
unpopular
.
In:O
1990:O
,:O
the:O
United:organization-government/governmentagency
Kingdom:organization-government/governmentagency
Conservative:organization-government/governmentagency
government:organization-government/governmentagency
,:O
headed:O
by:O
Prime:O
Minister:O
Margaret:person-politician
Thatcher:person-politician
introduced:O
a:O
poll:O
tax:O
,:O
which:O
was:O
very:O
unpopular:O
.:O