With no explanation, label each line with "location-GPE", "O", "person-politician", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
During
Mongkut
's
reign
,
the
power
of
the
House
of
Bunnag
reached
its
zenith
:
It
became
the
most
powerful
noble
family
of
Siam
.
During:O
Mongkut:person-politician
's:O
reign:O
,:O
the:O
power:O
of:O
the:O
House:O
of:O
Bunnag:O
reached:O
its:O
zenith:O
::O
It:O
became:O
the:O
most:O
powerful:O
noble:O
family:O
of:O
Siam:location-GPE
.:O