With no explanation, label each line with "location-GPE", "O", "building-theater", "person-artist/author", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
Merighi
is
known
to
have
sung
the
following
roles
in
Handel
's
operas
performed
at
the
King
's
Theatre
in
London
:
Merighi:person-artist/author
is:O
known:O
to:O
have:O
sung:O
the:O
following:O
roles:O
in:O
Handel:person-artist/author
's:O
operas:O
performed:O
at:O
the:O
King:building-theater
's:building-theater
Theatre:building-theater
in:O
London:location-GPE
::O