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 ":".
The
mechanism
underlying
this
phenomenon
involves
the
release
of
glutamate
by
these
pathologically
sensitized
C
fibers
.
The:O
mechanism:O
underlying:O
this:O
phenomenon:O
involves:O
the:O
release:O
of:O
glutamate:O
by:O
these:O
pathologically:O
sensitized:O
C:other-biologything
fibers:other-biologything
.:O