With no explanation, label each line with "O", "location-bodiesofwater", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
In
1955
,
the
area
around
Lake
Atitlán
became
a
national
park
.
In:O
1955:O
,:O
the:O
area:O
around:O
Lake:location-bodiesofwater
Atitlán:location-bodiesofwater
became:O
a:O
national:O
park:O
.:O