With no explanation, label each line with "O", "other-biologything", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Thus
,
HBB
mutants
are
the
sources
of
positive
selection
in
these
regions
and
are
important
for
their
long-term
survival
.
Thus:O
,:O
HBB:other-biologything
mutants:O
are:O
the:O
sources:O
of:O
positive:O
selection:O
in:O
these:O
regions:O
and:O
are:O
important:O
for:O
their:O
long-term:O
survival:O
.:O