z
=
(
-
1
,
-
0
.
7
6
-
0
.
6
4
)
u
=
(
0
.
9
2
1
0
6
1
,
0
.
3
8
9
4
1
8
,
0
)
r
p
l
u
s
t
r
u
e
f
a
l
s
e
φ
ψ
n
l
e
v
e
l
s
p
e
r
i
o
d
i
c
c
a
s
e
s
f
o
r
n
=
8
A
3
z
+
0
2
z
+
0
z
+
1
=
0
p
o
i
n
t
s
s
m
a
l
l
m
e
d
i
u
m
l
a
r
g
e
c
o
l
o
r
1
2
3
a
x
e
s