With no explanation, label each line with "O", "product-weapon", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
In
1984
,
2–66th
AR
transitioned
to
the
M1
Abrams
main
battle
tank
.
In:O
1984:O
,:O
2–66th:product-weapon
AR:product-weapon
transitioned:O
to:O
the:O
M1:product-weapon
Abrams:product-weapon
main:product-weapon
battle:product-weapon
tank:product-weapon
.:O