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 ":".
Four
train
pairs
run
on
operating
days
between
Ilmenau
and
Rennsteig
.
Four:O
train:O
pairs:O
run:O
on:O
operating:O
days:O
between:O
Ilmenau:location-GPE
and:O
Rennsteig:location-GPE
.:O