With no explanation, label each line with "art-broadcastprogram", "O", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
Two
years
later
,
in
1997
,
``
Gadget
Boy
&
amp
;
Heather
``
spawned
an
educational
spinoff
,
``
Gadget
Boy
's
Adventures
in
History
``
,
which
aired
on
The
History
Channel
.
Two:O
years:O
later:O
,:O
in:O
1997:O
,:O
``:O
Gadget:art-broadcastprogram
Boy:art-broadcastprogram
&:art-broadcastprogram
amp:art-broadcastprogram
;:art-broadcastprogram
Heather:art-broadcastprogram
``:O
spawned:O
an:O
educational:O
spinoff:O
,:O
``:O
Gadget:art-broadcastprogram
Boy:art-broadcastprogram
's:art-broadcastprogram
Adventures:art-broadcastprogram
in:art-broadcastprogram
History:art-broadcastprogram
``:O
,:O
which:O
aired:O
on:O
The:O
History:O
Channel:O
.:O