With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
In
most
natural
grass
fields
the
base
lines
where
baserunners
run
between
bases
is
dirt
.
In:O
most:O
natural:O
grass:O
fields:O
the:O
base:O
lines:O
where:O
baserunners:O
run:O
between:O
bases:O
is:O
dirt:O
.:O