With no explanation, label each line with "O", "location-mountain", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Erosion
by
glaciers
in
adjacent
cwms
caused
the
characteristic
arêtes
of
Crib
Goch
,
Crib
y
Ddysgl
and
Y
Lliwedd
,
and
the
pyramidal
peak
of
Snowdon
itself
.
Erosion:O
by:O
glaciers:O
in:O
adjacent:O
cwms:O
caused:O
the:O
characteristic:O
arêtes:O
of:O
Crib:location-mountain
Goch:location-mountain
,:O
Crib:location-mountain
y:location-mountain
Ddysgl:location-mountain
and:O
Y:location-mountain
Lliwedd:location-mountain
,:O
and:O
the:O
pyramidal:O
peak:O
of:O
Snowdon:location-mountain
itself:O
.:O