With no explanation, label each line with "O", "location-mountain", "location-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
glacier
begins
in
the
Alaska
Range
on
the
north
side
of
Denali
directly
below
the
Wickersham
Wall
,
heading
northeast
to
join
Peters
Glacier
after
the
latter
's
Tluna
Icefall
.
The:O
glacier:O
begins:O
in:O
the:O
Alaska:location-mountain
Range:location-mountain
on:O
the:O
north:O
side:O
of:O
Denali:location-mountain
directly:O
below:O
the:O
Wickersham:location-mountain
Wall:location-mountain
,:O
heading:O
northeast:O
to:O
join:O
Peters:location-other
Glacier:location-other
after:O
the:O
latter:O
's:O
Tluna:location-other
Icefall:location-other
.:O