In the list of tokens, identify 'Person', 'Location', and 'Organisation' and label each accordingly. If the entity spans multiple tokens, use the prefix B-PER, B-LOC, or B-ORG for the first token, and I-PER, I-LOC, or I-ORG for the subsequent tokens of that entity. The beginning of each separate entity should always be labeled with a B-PER, B-LOC, or B-ORG prefix. If the token does not fit into any of the three named categories, or is not a named entity, label it as 'O'. Each line should contain one token and its corresponding label, separated by a colon. Do not combine tokens on your own. The format for each line should be: 'token:label'.

Text: Two
years
in
,
insurers
are
just
now
starting
to
get
a
firm
grip
on
costs
,
as
they
have
more
data
on
consumer
health
care
spending
.
Answer: 
Two:O
years:O
in:O
,:O
insurers:O
are:O
just:O
now:O
starting:O
to:O
get:O
a:O
firm:O
grip:O
on:O
costs:O
,:O
as:O
they:O
have:O
more:O
data:O
on:O
consumer:O
health:O
care:O
spending:O
.:O