With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Using
Lydenburg
as
his
base
,
he
made
a
number
of
collecting
trips
.
Using:O
Lydenburg:location-GPE
as:O
his:O
base:O
,:O
he:O
made:O
a:O
number:O
of:O
collecting:O
trips:O
.:O