With no explanation, label each line with "location-GPE", "O", "location-bodiesofwater", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
focus
of
intense
land
speculation
activity
in
Minnesota
and
Iowa
during
the
mid-1850s
inevitably
turned
toward
the
Big
Sioux
River
valley
.
The:O
focus:O
of:O
intense:O
land:O
speculation:O
activity:O
in:O
Minnesota:location-GPE
and:O
Iowa:O
during:O
the:O
mid-1850s:O
inevitably:O
turned:O
toward:O
the:O
Big:location-bodiesofwater
Sioux:location-bodiesofwater
River:location-bodiesofwater
valley:O
.:O