With no explanation, label each line with "O", "person-athlete", "organization-sportsteam", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
After
four
years
in
which
the
club
was
relegated
twice
and
promoted
once
,
Huizingh
signed
for
FC
Groningen
again
in
1990
.
After:O
four:O
years:O
in:O
which:O
the:O
club:O
was:O
relegated:O
twice:O
and:O
promoted:O
once:O
,:O
Huizingh:person-athlete
signed:O
for:O
FC:organization-sportsteam
Groningen:organization-sportsteam
again:O
in:O
1990:O
.:O