With no explanation, label each line with "location-GPE", "O", "location-road/railway/highway/transit", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
At
Calmar
,
US
52
turns
to
the
north
towards
Decorah
.
At:O
Calmar:location-GPE
,:O
US:location-road/railway/highway/transit
52:location-road/railway/highway/transit
turns:O
to:O
the:O
north:O
towards:O
Decorah:O
.:O