4
a
lteRnatiVe positioning
4
a
15
a
3
a
15
a
a
lteRnatiVe positioning
5
positioning
4
(3
)
b
b
19
b
(18
)
b
9
b
(10
)
b
10
c
(11
)
c
19
(18
)
b
b
10
c
(11
)
c
6
11
b
16
c
12
b
b12
a
12
a
a12
a
20
5
a
b
a12
a
15
b
1
d
21
a
3
d
6
d
4
a
16
17
b
19
20
c
22
a
19
c
22
a
22
a
b12
a
5
d
2
d
4
2
b
8
b
b
3
a
B
10
c
15
c
b
3
b
10
b
13
14
b
21
c
19
a
4
4
d
18
c
17
c
1
b
17
a
7
b
16
a
19
a
21
c
b
13
c
9
b
11
b
c
14
c
18
b
