SC = = V V V SM SN SP SN1 1 1 1 2 2 2 7= + = + = + =
4
.
SN
7
ST
=
4
2
10
5
.
SC
=
=
V
V
V
SM SN
SP SN
1
1
1 1 2
2 2
7
=
+
=
+
=
+
=
.
.
.
S AMNP
S AMN
S ANP
.
.
.
.
.
2
2
2 2 5
5 3
30
V
S
V
SB SC
SD SC
S ABCD
S ACB
S ACD
7
23
20
30
.
V
=
V
−
V
= −
V
V
=
V
ABCD AMNP
S ABCD
S AMNP