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 ":".
An
alternate
route
up
the
mountain
is
to
start
at
the
Western
end
of
the
Bwlch-y-Ddeufaen
pass
and
take
the
steep
track
up
the
side
of
Drosgyl
,
following
the
fence
line
all
the
way
to
where
the
ground
levels
off
.
An:O
alternate:O
route:O
up:O
the:O
mountain:O
is:O
to:O
start:O
at:O
the:O
Western:O
end:O
of:O
the:O
Bwlch-y-Ddeufaen:location-mountain
pass:location-mountain
and:O
take:O
the:O
steep:O
track:O
up:O
the:O
side:O
of:O
Drosgyl:location-mountain
,:O
following:O
the:O
fence:O
line:O
all:O
the:O
way:O
to:O
where:O
the:O
ground:O
levels:O
off:O
.:O