With no explanation, label each line with "product-airplane", "O", "organization-government/governmentagency", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
After
a
brief
selection
period
,
the
``
Reichsluftfahrtministerium
``
(
German
Air
Ministry
,
RLM
)
decided
on
the
Heinkel
He
60
biplane
.
After:O
a:O
brief:O
selection:O
period:O
,:O
the:O
``:O
Reichsluftfahrtministerium:organization-government/governmentagency
``:O
(:O
German:organization-government/governmentagency
Air:organization-government/governmentagency
Ministry:organization-government/governmentagency
,:O
RLM:organization-government/governmentagency
):O
decided:O
on:O
the:O
Heinkel:product-airplane
He:product-airplane
60:product-airplane
biplane:O
.:O