comp
(
a
,
b
) =
-
,
comp
(
a
,
b
)
b
o
=
-
(
i
+
j
-
3
k
)
,
comp
(
b
,
a
) =
-
, °
comp
(
b
,
a
)
a
o
=
-
(3
i
-
4
j
+ 2
k
)
.