With no explanation, label each line with "O", "organization-company", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
In
1953
,
Morton
Air
Services
gained
control
of
its
independent
rival
Olley
Air
Service
.
In:O
1953:O
,:O
Morton:organization-company
Air:organization-company
Services:organization-company
gained:O
control:O
of:O
its:O
independent:O
rival:O
Olley:organization-company
Air:organization-company
Service:organization-company
.:O