With no explanation, label each line with "O", "other-astronomything", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
``
21
Aquarii
``
is
the
Flamsteed
designation
.
``:O
21:other-astronomything
Aquarii:other-astronomything
``:O
is:O
the:O
Flamsteed:other-astronomything
designation:O
.:O