With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
Muscle
weakness
usually
begins
around
the
age
of
four
,
and
worsens
quickly
.
Muscle:O
weakness:O
usually:O
begins:O
around:O
the:O
age:O
of:O
four:O
,:O
and:O
worsens:O
quickly:O
.:O