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 ":".
Unlike
the
guitar
,
it
has
been
transformed
by
Peruvian
players
over
the
years
,
changing
from
a
12-string
,
6-course
instrument
to
one
having
12
to
16
strings
in
a
mere
four
courses
.
Unlike:O
the:O
guitar:O
,:O
it:O
has:O
been:O
transformed:O
by:O
Peruvian:location-GPE
players:O
over:O
the:O
years:O
,:O
changing:O
from:O
a:O
12-string:O
,:O
6-course:O
instrument:O
to:O
one:O
having:O
12:O
to:O
16:O
strings:O
in:O
a:O
mere:O
four:O
courses:O
.:O