With no explanation, label each line with "O", "organization-company", "organization-government/governmentagency", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
It
is
operated
by
Bangkok
Mass
Transit
System
PCL
(
BTSC
)
,
a
subsidiary
of
BTS
Group
Holdings
,
under
a
concession
granted
by
the
Bangkok
Metropolitan
Administration
(
BMA
)
.
It:O
is:O
operated:O
by:O
Bangkok:organization-company
Mass:organization-company
Transit:organization-company
System:organization-company
PCL:organization-company
(:O
BTSC:organization-company
):O
,:O
a:O
subsidiary:O
of:O
BTS:organization-company
Group:organization-company
Holdings:organization-company
,:O
under:O
a:O
concession:O
granted:O
by:O
the:O
Bangkok:organization-government/governmentagency
Metropolitan:organization-government/governmentagency
Administration:organization-government/governmentagency
(:O
BMA:organization-government/governmentagency
):O
.:O