With no explanation, label each line with "O", "event-attack/battle/war/militaryconflict", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
assessment
of
Custer
's
actions
during
the
American
Indian
Wars
has
undergone
substantial
reconsideration
in
modern
times
.
The:O
assessment:O
of:O
Custer:person-other
's:O
actions:O
during:O
the:event-attack/battle/war/militaryconflict
American:event-attack/battle/war/militaryconflict
Indian:event-attack/battle/war/militaryconflict
Wars:event-attack/battle/war/militaryconflict
has:O
undergone:O
substantial:O
reconsideration:O
in:O
modern:O
times:O
.:O