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: At
the
halfway
mark
for
2015
,
unit
sales
amounted
to
8.5
million
units
or
17.0
million
units
on
an
annualized
basis
,
up
about
4
%
from
the
year
-
earlier
period
.
Answer: 
At:O
the:O
halfway:O
mark:O
for:O
2015:O
,:O
unit:O
sales:O
amounted:O
to:O
8.5:O
million:O
units:O
or:O
17.0:O
million:O
units:O
on:O
an:O
annualized:O
basis:O
,:O
up:O
about:O
4:O
%:O
from:O
the:O
year:O
-:O
earlier:O
period:O
.:O