With no explanation, label each line with "location-GPE", "person-athlete", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Pavel
Aubrecht
is
a
Czech
skater
.
Pavel:person-athlete
Aubrecht:person-athlete
is:O
a:O
Czech:location-GPE
skater:O
.:O