With no explanation, label each line with "O", "person-scholar", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
M.L
Marconi
and
A.
Korth
et
al
.
M.L:person-scholar
Marconi:person-scholar
and:O
A.:O
Korth:O
et:O
al:O
.:O