With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
It
operated
using
the
call-sign
XA99
.
It:O
operated:O
using:O
the:O
call-sign:O
XA99:O
.:O