With no explanation, label each line with "product-other", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Ground-penetrating
radar
instruments
on
the
Mars
Express
orbiter
(
MARSIS
)
and
the
Mars
Reconnaissance
Orbiter
(
SHARAD
)
are
currently
providing
stunning
echo-return
data
on
subsurface
materials
and
structures
to
depths
of
up
to
5
km
.
Ground-penetrating:O
radar:O
instruments:O
on:O
the:O
Mars:product-other
Express:product-other
orbiter:product-other
(:product-other
MARSIS:product-other
):product-other
and:O
the:O
Mars:product-other
Reconnaissance:product-other
Orbiter:product-other
(:product-other
SHARAD:product-other
):product-other
are:O
currently:O
providing:O
stunning:O
echo-return:O
data:O
on:O
subsurface:O
materials:O
and:O
structures:O
to:O
depths:O
of:O
up:O
to:O
5:O
km:O
.:O