(
1
;
0
;
−
2
)
+
(
2
;
2
;
1
)
=
(
3
;
2
;
−
1
)
(
1
;
0
;
−
2
)
+
(
2
;
2
;
1
)
=
(
3
;
2
;
−
1
)
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